Record one more reason that download is canceled

Download was cancelled when a dangerous download infobar is dismissed.
We missed it in the previous CL.

BUG=618864

Review-Url: https://codereview.chromium.org/2111983002
Cr-Commit-Position: refs/heads/master@{#403274}

chrome/browser/android/download/download_controller.cc

@@ -424,8 +424,11 @@ void DownloadController::DangerousDownloadValidated(
   DownloadItem* item = dlm->GetDownloadByGuid(download_guid);
   if (!item)
     return;
-  if (accept)
+  if (accept) {
     item->ValidateDangerousDownload();
-  else
+  } else {
+    DownloadController::RecordDownloadCancelReason(
+        DownloadController::CANCEL_REASON_DANGEROUS_DOWNLOAD_INFOBAR_DISMISSED);
     item->Remove();
+  }
 }

chrome/browser/android/download/download_controller.h

@@ -59,6 +59,7 @@ class DownloadController : public DownloadControllerBase {
     CANCEL_REASON_NOTIFICATION_DISMISSED,
     CANCEL_REASON_OVERWRITE_INFOBAR_DISMISSED,
     CANCEL_REASON_NO_STORAGE_PERMISSION,
+    CANCEL_REASON_DANGEROUS_DOWNLOAD_INFOBAR_DISMISSED,
     CANCEL_REASON_MAX
   };
   static void RecordDownloadCancelReason(DownloadCancelReason reason);

tools/metrics/histograms/histograms.xml

@@ -82706,6 +82706,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="2" label="Notification dismissed"/>
   <int value="3" label="Overwrite infobar dismissed"/>
   <int value="4" label="No storage permission"/>
+  <int value="5" label="Dangerous download infobar dismissed"/>
 </enum>
 
 <enum name="MobileDownloadInterceptFailureReason" type="int">