AI 144000: am: CL 143999 am: CL 143998 Fix #1750489. Call WebKit's...

AI 144000: am: CL 143999 am: CL 143998 Fix #1750489. Call WebKit's setNetworkOnLine from WebCore thread instead of UI thread as WebKit is not thread safe.
  Using the same code pattern as the rest of the file:
  . throw IllegalStateException if BrowserFrame.sJavaBridge is null in pauseTimers/resumeTimers.
  . use (msg.arg1 == 1) to pass the boolean from WebView to WebViewCore as in CLEAR_CACHE
  Original author: klobag
  Merged from: //branches/cupcake/...
  Original author: android-build
  Merged from: //branches/donutburger/...

Automated import of CL 144000