Fix accessible alert for deep scanning prompt

The accessible alert while prompting the user for deep scanning is still
"Downloading, 0% remaining", which is jarring. This CL fixes that.

Bug: 1056350
Change-Id: I5e10dcc702c6bef8368492819ce67e432dd469b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076429Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745122}

chrome/app/generated_resources.grd

@@ -1985,6 +1985,20 @@ are declared in tools/grit/grit_rule.gni.
           </message>
         </else>
       </if>
+      <if expr="is_macosx">
+        <then>
+          <message name="IDS_PROMPT_APP_DEEP_SCANNING_ACCESSIBLE_ALERT"
+                   desc="The title of a download notification inidcating that the file may be malicious, and the Advanced Protection Program recommends sending the file to Google. This message is for screen reader users">
+            Advanced Protection recommends sending <ph name="FILE_NAME">$1<ex>file.exe</ex></ph> to Google to check for malware.
+          </message>
+        </then>
+        <else>
+          <message name="IDS_PROMPT_APP_DEEP_SCANNING_ACCESSIBLE_ALERT"
+                   desc="The title of a download notification inidcating that the file may be malicious, and the Advanced Protection Program recommends sending the file to Google. This message is for screen reader users">
+            Advanced Protection recommends sending <ph name="FILE_NAME">$1<ex>file.exe</ex></ph> to Google to check for malware. Press Shift+F6 to cycle to the downloads bar area.
+          </message>
+        </else>
+      </if>
 
       <!-- Download Notification Labels -->
       <message name="IDS_DOWNLOAD_NOTIFICATION_COPY_TO_CLIPBOARD"

chrome/browser/ui/views/download/download_item_view.cc

@@ -1109,6 +1109,12 @@ void DownloadItemView::TransitionToDeepScanningDialog() {
 
   ShowDeepScanningDialog();
 
+  UpdateAccessibleAlert(
+      l10n_util::GetStringFUTF16(
+          IDS_PROMPT_APP_DEEP_SCANNING_ACCESSIBLE_ALERT,
+          model_->GetFileNameToReportUser().LossyDisplayName()),
+      false);
+
   // We need to load the icon now that the download has the real path.
   LoadIcon();