Bug 1213366 - Remove android: prefix from colorPrimary*. r=sebastian

This changes the color of the settings action bar to grey, as expected.

Note that I was unaware of this no-prefix convention when I wrote the previous
patch and added an "android:actionBarStyle" which may be confusing things
further. We may also benefit from removing the prefix there and fixing the
results.

--HG--
extra : commitid : 6aYSAKTkbkB
extra : rebase_source : cc66caa6da48dce95b58f4fd225ac01f1ffa9ee7

mobile/android/base/resources/values-v21/themes.xml

@@ -9,8 +9,8 @@
         Base application theme.
     -->
     <style name="GeckoBase" parent="Theme.AppCompat.Light.DarkActionBar">
-        <item name="android:colorPrimary">@color/text_and_tabs_tray_grey</item>
-        <item name="android:colorPrimaryDark">@color/text_and_tabs_tray_grey</item>
+        <item name="colorPrimary">@color/text_and_tabs_tray_grey</item>
+        <item name="colorPrimaryDark">@color/text_and_tabs_tray_grey</item>
         <item name="android:windowNoTitle">true</item>
         <item name="android:windowContentOverlay">@null</item>
         <item name="android:actionBarStyle">@style/GeckoActionBar</item>