Bug 1147121 - Change colorPrimary from primary to text_and_tabs_tray_…

…grey. r=me

My work in bug 1134484 (color palette v1) will break this - easier to fix it
now. Note that the colors are identical.

mobile/android/base/resources/values/themes.xml

@@ -116,7 +116,7 @@
         <!-- Set the app's title bar color in the recent app switcher.
 
              Note: We'd prefer not to show up in the recent app switcher (bug 1137928). -->
-        <item name="android:colorPrimary">@color/primary</item>
+        <item name="android:colorPrimary">@color/text_and_tabs_tray_grey</item>
         <!-- We display the overlay on top of other Activities so show their status bar. -->
         <item name="android:statusBarColor">@android:color/transparent</item>
     </style>