[AdBlock]:Add the menu item(Block float popups) for the AdBlock

N/A

Add the menu item for the AdBlock, when user choose the menu item(Block float popups),
the AdBlock is available, otherwise, the AdBlock will be unvalid.

Change-Id: I3ea9f7f5676ec3ef731ccddc396b4ff21fa977d7
Ref-Id: I83d1c6a8b383e0b3d88e43a8b4f63be4ef2627ba

Conflicts:

	framework.jar.out/smali/android/webkit/WebSettingsClassic.smali