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/values/styles.xml b/res/values/styles.xml
index d97a286..db4ac91 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -66,6 +66,9 @@
     <style name="ShortcutTheme" parent="@style/BrowserBase">
     </style>
 
+    <style name="SettingsTheme" parent="@style/BrowserBase">
+    </style>
+
 
     <style name="NavButton">
         <item name="android:background">?android:attr/selectableItemBackground</item>
@@ -79,8 +82,9 @@
 
     <style name="OverflowButton" parent="@android:style/Widget.Holo.Light.ActionButton.Overflow">
         <item name="android:src">@drawable/ic_action_overflow</item>
-        <item name="android:layout_width">48dp</item>
+        <item name="android:layout_width">44dp</item>
         <item name="android:layout_height">match_parent</item>
+        <item name="android:paddingLeft">4dp</item>
         <item name="android:gravity">center_vertical</item>
     </style>