Bug 1342968 - Remove unused TabsLayout xml style attributes. r=sebastian

All TabsLayouts are RecyclerViews now.
* Orientation on a RecyclerView is set on the LayoutManager, not the
  RecyclerView;
* android:listSelector doesn't apply to RecyclerView;
* android:choiceMode doesn't apply to RecyclerView.

This patch also fixes bug 1337699 when it removes the old
android:scrollbars="horizontal" in values-land/styles.xml from back when the
tabs tray scrolled horizontally in landscape mode.

MozReview-Commit-ID: 97el99fSi5o

--HG--
extra : rebase_source : 6d5c41be3b217abbd5524f1901193cdca0fc939c

mobile/android/base/resources/layout/private_tabs_panel.xml

@@ -19,7 +19,6 @@
           style="@style/TabsLayout"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
-          android:choiceMode="singleChoice"
           gecko:tabs="tabs_private"/>
 
 </merge>

mobile/android/base/resources/layout/tabs_panel_default.xml

@@ -85,7 +85,6 @@
               style="@style/TabsLayout"
               android:layout_width="match_parent"
               android:layout_height="match_parent"
-              android:choiceMode="singleChoice"
               android:visibility="gone"
               gecko:tabs="tabs_normal"/>
 

mobile/android/base/resources/values-land/styles.xml

@@ -5,11 +5,6 @@
 
 <resources>
 
-    <style name="TabsLayout" parent="TabsLayoutBase">
-         <item name="android:orientation">horizontal</item>
-         <item name="android:scrollbars">horizontal</item>
-    </style>
-
     <style name="TabsItem">
          <item name="android:nextFocusDown">@+id/close</item>
     </style>

mobile/android/base/resources/values-large-land-v11/styles.xml

@@ -5,10 +5,6 @@
 
 <resources>
 
-    <style name="TabsLayout" parent="TabsLayoutBase">
-         <item name="android:scrollbars">vertical</item>
-    </style>
-
     <style name="Widget.BookmarksListView" parent="Widget.HomeListView">
         <item name="android:scrollbarStyle">outsideOverlay</item>
     </style>

mobile/android/base/resources/values-large/styles.xml

@@ -22,10 +22,6 @@
         <item name="android:orientation">horizontal</item>
     </style>
 
-    <style name="TabsLayout" parent="TabsLayoutBase">
-         <item name="android:scrollbars">vertical</item>
-    </style>
-
     <style name="TabsItem">
          <item name="android:nextFocusDown">@+id/close</item>
     </style>

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

@@ -471,13 +471,8 @@
     </style>
 
     <!-- TabsLayout -->
-    <style name="TabsLayoutBase">
+    <style name="TabsLayout">
          <item name="android:background">@android:color/transparent</item>
-         <item name="android:listSelector">@android:color/transparent</item>
-    </style>
-
-    <style name="TabsLayout" parent="TabsLayoutBase">
-         <item name="android:orientation">vertical</item>
          <item name="android:scrollbars">vertical</item>
     </style>