Update Deep Scanning download strings on Chrome OS.

Update the Chrome OS-only strings according to
https://docs.google.com/document/d/17ZQF59-5Quw542S9SlnCkFfp8a100ZU2Pn5NOZqyJrE/edit?usp=sharing

Include 3 changes:
1) Show filename instead of "Scan complete, no issues identified" for
the case of successful scans, so it looks like a normal download.
2) Change all the strings for notification while scanning, so it's:
Scanning <filename>       In progress
Checking with your organization's security policies.
https://drive.google.com/open?id=1S6J03NbR-3Uv6MDlRse5SwjmC-fi3rPT
3) Show reason for downloads blocked due to large size or being
encrypted.

Bug: 1081203
Bug: b/153456225
Change-Id: I3c7e59e3a0a7cae0ce2a105f3dfac422a2fc30a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2230467Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776619}

chrome/app/generated_resources.grd

@@ -1607,6 +1607,10 @@ are declared in tools/grit/grit_rule.gni.
                  desc="The title of a download notification for offline pages not stored in Downloads.">
                  Page is ready to view
         </message>
+        <message name="IDS_DOWNLOAD_STATUS_SCAN_TITLE"
+                 desc="The title of a download notification: the current download is being scanned.">
+                 Scanning <ph name="FILE_NAME">$1<ex>somedocument.pdf</ex></ph>
+        </message>
         <message name="IDS_DOWNLOAD_NOTIFICATION_STATUS_COMPLETED"
                  desc="Size and units downloaded, and the origin domain.">
           <ph name="DOWNLOAD_RECEIVED">$1<ex>154 MB</ex></ph> from <ph name="DOWNLOAD_DOMAIN">$2<ex>example.com</ex></ph>
@@ -1653,9 +1657,6 @@ are declared in tools/grit/grit_rule.gni.
       <message name="IDS_DOWNLOAD_STATUS_INTERRUPTED" desc="Status text for a download item that was interrupted.">
         Failed - <ph name="INTERRUPT_REASON">$1<ex>Disk full</ex></ph>
       </message>
-      <message name="IDS_DOWNLOAD_STATUS_SCANNED" desc="Status text for a download item that being scanned.">
-        Being scanned
-      </message>
       <message name="IDS_DOWNLOAD_UNCONFIRMED_PREFIX" desc="The prefix used in the unconfirmed download file.">
         Unconfirmed
       </message>
@@ -1691,6 +1692,10 @@ are declared in tools/grit/grit_rule.gni.
         desc="Message shown in the download shelf when a download is being scanned">
         Checking <ph name="FILE_NAME">$1<ex>bla.exe</ex></ph> with your organization's security policies...
       </message>
+      <message name="IDS_PROMPT_DEEP_SCANNING_DOWNLOAD_SHORT"
+        desc="Message shown in the download shelf when a download is being scanned, without the file name">
+        Checking with your organization's security policies.
+      </message>
       <message name="IDS_PROMPT_CONFIRM_MIXED_CONTENT_DOWNLOAD"
         desc="Message shown to the user to validate the download when the download content is a mixed-content download.">
         <ph name="FILE_NAME">$1<ex>bla.exe</ex></ph> can't be downloaded securely

chrome/browser/download/notification/download_item_notification.cc

@@ -720,6 +720,11 @@ base::string16 DownloadItemNotification::GetTitle() const {
 
   base::string16 file_name =
       item_->GetFileNameToReportUser().LossyDisplayName();
+  if (IsScanning()) {
+    return l10n_util::GetStringFUTF16(IDS_DOWNLOAD_STATUS_SCAN_TITLE,
+                                      file_name);
+  }
+
   switch (item_->GetState()) {
     case download::DownloadItem::IN_PROGRESS:
       if (!item_->IsPaused()) {
@@ -848,6 +853,14 @@ base::string16 DownloadItemNotification::GetWarningStatusString() const {
       return l10n_util::GetStringFUTF16(IDS_PROMPT_DOWNLOAD_CHANGES_SETTINGS,
                                         elided_filename);
     }
+    case download::DOWNLOAD_DANGER_TYPE_BLOCKED_TOO_LARGE: {
+      return l10n_util::GetStringFUTF16(IDS_PROMPT_DOWNLOAD_BLOCKED_TOO_LARGE,
+                                        elided_filename);
+    }
+    case download::DOWNLOAD_DANGER_TYPE_BLOCKED_PASSWORD_PROTECTED: {
+      return l10n_util::GetStringFUTF16(
+          IDS_PROMPT_DOWNLOAD_BLOCKED_PASSWORD_PROTECTED, elided_filename);
+    }
     case download::DOWNLOAD_DANGER_TYPE_SENSITIVE_CONTENT_WARNING: {
       return l10n_util::GetStringFUTF16(
           IDS_PROMPT_DOWNLOAD_SENSITIVE_CONTENT_WARNING, elided_filename);
@@ -860,8 +873,6 @@ base::string16 DownloadItemNotification::GetWarningStatusString() const {
     case download::DOWNLOAD_DANGER_TYPE_PROMPT_FOR_SCANNING:
     case download::DOWNLOAD_DANGER_TYPE_DEEP_SCANNED_SAFE:
     case download::DOWNLOAD_DANGER_TYPE_DEEP_SCANNED_OPENED_DANGEROUS:
-    case download::DOWNLOAD_DANGER_TYPE_BLOCKED_TOO_LARGE:
-    case download::DOWNLOAD_DANGER_TYPE_BLOCKED_PASSWORD_PROTECTED:
     case download::DOWNLOAD_DANGER_TYPE_ASYNC_SCANNING:
     case download::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS:
     case download::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT:
@@ -880,9 +891,9 @@ base::string16 DownloadItemNotification::GetInProgressSubStatusString() const {
   if (item_->IsPaused())
     return l10n_util::GetStringUTF16(IDS_DOWNLOAD_PROGRESS_PAUSED);
 
-  // "Being scanned"
+  // "In progress" (scanning)
   if (IsScanning())
-    return l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_SCANNED);
+    return l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_IN_PROGRESS_SHORT);
 
   base::TimeDelta time_remaining;
   // time_remaining is only known if the download isn't paused.
@@ -922,9 +933,6 @@ base::string16 DownloadItemNotification::GetSubStatusString() const {
     return GetWarningStatusString();
 
   if (item_->GetDangerType() ==
-      download::DownloadDangerType::DOWNLOAD_DANGER_TYPE_DEEP_SCANNED_SAFE) {
-    return l10n_util::GetStringUTF16(IDS_PROMPT_DOWNLOAD_DEEP_SCANNED_SAFE);
-  } else if (item_->GetDangerType() ==
              download::DownloadDangerType::
                  DOWNLOAD_DANGER_TYPE_DEEP_SCANNED_OPENED_DANGEROUS) {
     return l10n_util::GetStringUTF16(
@@ -978,6 +986,10 @@ base::string16 DownloadItemNotification::GetStatusString() const {
   if (item_->IsDangerous() || item_->IsMixedContent())
     return base::string16();
 
+  if (IsScanning()) {
+    return l10n_util::GetStringUTF16(IDS_PROMPT_DEEP_SCANNING_DOWNLOAD_SHORT);
+  }
+
   // The hostname. (E.g.:"example.com" or "127.0.0.1")
   base::string16 host_name = url_formatter::FormatUrlForSecurityDisplay(
       item_->GetURL(), url_formatter::SchemeDisplay::OMIT_HTTP_AND_HTTPS);