Fix build warnings.

Change-Id: I20117cf287ca25387c8664de2096c00ef63ec1e5

Conflicts:

	res/values-nl/donottranslate-search_engines.xml
Revert "Runtime enablement of WebGL"

This reverts commit bf0a8056a03c82bf07a753131e577e9e0134055a.

Conflicts:

	res/values/strings.xml
	res/xml-sw600dp/lab_preferences.xml
	res/xml/lab_preferences.xml
	src/com/android/browser/BrowserSettings.java
	src/com/android/browser/PreferenceKeys.java

Change-Id: I0174cc19c108e97986af43e31b8b1a0ef0aed677