GitLab

Preparation CL for adding crash metrics UMA counters to ChromeFrame. Basically this would mean that metrics reporting would be done directly
by ChromeFrame. Currently ChromeFrame uses Chrome to upload this data. 

Refactored the chrome metrics service and metrics logging functionality into base classes defined in chrome\common\metrics_helpers.cc/.h. While
this refactoring is by no means complete it is a first step to avoid needless code duplication between chrome and chrome frame.

Bug=46057

Review URL: http://codereview.chromium.org/2744003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@49354 0039d316-1c4b-4281-b951-d872f2087c98