browser: Fix occasional NPE

view.getUrl() may sometimes return null.  syncCurrentState() checks for
null when setting mCurrentState.mUrl so use that instead.

Change-Id: I487249c6665d192b3c95e09a0b64ee840202f127
blue to grey browser's progress bar

Change-Id: I7cabb70f84cd4f6c65a1c8b197831dad822498fa
fix browser blue textfield

Change-Id: I6f7fb8b0ff61d4d9d78a8580450f7d299c41d449