Browser: Remove unused strings

Change-Id: Ib83f179f71dee3b33f6dfbd3a86f1108cffba350
Reimplement titlebar autohiding to be compatible with chromium webview.

Patch Set 4: Fix code formatting

Change-Id: I4de873f7c089d4f7dede944d05f48d03000f3d99
Merge branch "cm-11.0" into kylin