Revert 247760 "Add UMA stats for ExtensionCache"
> Add UMA stats for ExtensionCache
>
> Reported metrics:
> - number of extensions in cache
> - size of cache on disk
>
> BUG=316371
> TEST=manual
>
> Review URL: https://codereview.chromium.org/
148013004
This causes compile failures on ChromeOS. See comments on original CL for
details.
TBR=dpolukhin@chromium.org
Review URL: https://codereview.chromium.org/
139173009
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247822 0039d316-1c4b-4281-b951-d872f2087c98