Clean visual style, part II: extend bright style, convert icons, more touch-ups.

This commit removes the remaining white icons from the previous style,
which was a mix of 'holo dark' (i.e. light) icons and other un-fitting
icons. It's all replaced with theme-colored icons.

The primary color itself had been altered a bit towards green (#18aba1).
Other than the icon replacements, this commit changes:
 - tab switcher: fix cosmetic bug in the title bar in <= xhdpi devices
 - tab switcher: better incognito presentation
 - settings: enable back (<-) arrow
 - settings: bold color in the activity (on L and up)
 - settings: rationalized launching
 - better spacings on the mobile title bar
 - better padding on history items
 - add proportional padding (1em) to the incognito page
 - the incognito tab bar gets a bit darker
 - ['Ingnito Page', 'New Incognito Tab'] -> 'Private Browsing'
 - 'Page info' -> 'Page information' (no abbrevs when user facing :)

Vast amount of unused resources are removed from the APK.

Change-Id: I4add15fc686495ce27f63e26c2c56c14fa3d6603
diff --git a/res/layout/nav_tab_view.xml b/res/layout/nav_tab_view.xml
index 36e2082..a126732 100644
--- a/res/layout/nav_tab_view.xml
+++ b/res/layout/nav_tab_view.xml
@@ -16,11 +16,11 @@
 
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/main"
+    android:id="@+id/nav_tab"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:orientation="vertical"
-    android:background="@drawable/nav_tab_title"
+    android:background="@drawable/nav_tab_title_normal"
     android:focusable="false">
     <LinearLayout
         android:id="@+id/titlebar"
@@ -49,7 +49,7 @@
             android:layout_gravity="center_vertical"
             android:contentDescription="@string/accessibility_button_closetab"
             android:paddingRight="16dip"
-            android:src="@drawable/ic_action_stop" />
+            android:src="@drawable/ic_action_close" />
     </LinearLayout>
 
     <!-- Preview Image -->