Revert 250828 "Add a UMA stat to track if the Browser blacklist ..."
Speculative revert for failures here:
http://build.chromium.org/p/chromium.win/builders/Win7%20Sync%20x64/builds/11201
> Add a UMA stat to track if the Browser blacklist is Set on the Renderer
>
> This shouldn't be happening, but we got some crash reports suggesting it
> does. Unable to repo locally so this stat will verify it does occur and
> then can be used to verify our fixes actually fix it.
>
> BUG=329023
>
> Review URL: https://codereview.chromium.org/
140763008
TBR=csharp@chromium.org
Review URL: https://codereview.chromium.org/
163633005
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251095 0039d316-1c4b-4281-b951-d872f2087c98