Password Manager settings page: announce credentials deletion.

After the user clicks bin icon, display the toast that notifies about
the deletion.

BUG=764078

Change-Id: Ie50bea0d7d7a730e1522ca85bd7e136829e5e14a
Reviewed-on: https://chromium-review.googlesource.com/670863Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Tatiana Gornak <melandory@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502909}

chrome/android/java/src/org/chromium/chrome/browser/preferences/password/PasswordEntryEditor.java

@@ -261,6 +261,9 @@ public class PasswordEntryEditor extends Fragment {
                 if (!mException) {
                     passwordUIView.removeSavedPasswordEntry(mID);
                     passwordUIView.destroy();
+                    Toast.makeText(getActivity().getApplicationContext(), R.string.deleted,
+                                 Toast.LENGTH_SHORT)
+                            .show();
                     getActivity().finish();
                 }
             }
@@ -270,6 +273,9 @@ public class PasswordEntryEditor extends Fragment {
                 if (mException) {
                     passwordUIView.removeSavedPasswordException(mID);
                     passwordUIView.destroy();
+                    Toast.makeText(getActivity().getApplicationContext(), R.string.deleted,
+                                 Toast.LENGTH_SHORT)
+                            .show();
                     getActivity().finish();
                 }
             }

chrome/android/java/strings/android_chrome_strings.grd

@@ -125,6 +125,9 @@ CHAR-LIMIT guidelines:
   <release allow_pseudo="false" seq="1">
     <messages fallback_to_english="true">
       <!-- Generic strings -->
+      <message name="IDS_DELETED" desc='Text that announces to the user that something was deleted.'>
+        Deleted
+      </message>
       <message name="IDS_OK" desc="Label for a confirm button. Used in multiple contexts. [CHAR-LIMIT=20]">
         OK
       </message>