Update icon script to update all icon files.

Added beta icon svg.

Change-Id: I76484ef9fa6ca17b5ba31be4469d7d04502fab9f
Clear the webview immediately when loading a new page.

From a UX perspective we want to clear the contents of the current page
as quickly as possible when we get the request for a new one. Setting
the content div innerHTML to an empty string via javascript is the
fastest and most efficient way to do this. I did not implement a
spinner as mentioned in the ticket.

Bug: 70422
Change-Id: Idd0adb963619e2abdaaefce7e4e6e7b38b42b7dd
Protection against nil title or domain crashes.

Change-Id: I26aa76563b8d2cbee9efa64cebdd6d1a1b7b4ae2
Merge "Update icon script to update all icon files."
Merge "Protection against nil title or domain crashes."