Update ScriptController's resourceInfo() to use V8TRYCATCH_FOR_V8STRINGRESOURCE_RETURN()

Update ScriptController's resourceInfo() to use V8TRYCATCH_FOR_V8STRINGRESOURCE_RETURN()
macro instead of toWebCoreString(v8::Handle<v8::Value>), to make sure we abort early
in the event v8::Value::ToString() throws an exception.

R=haraken

Review URL: https://codereview.chromium.org/68073005

git-svn-id: svn://svn.chromium.org/blink/trunk@162128 bbb929c8-8fbe-4397-9dbb-9b2b20218538