Revert 232456 "Convert ExtensionProcessManager to BrowserContext..."

> Convert ExtensionProcessManager to BrowserContext, part 1
> 
> Part of moving ExtensionProcessManager to src/extensions.
> * Introduce more test coverage
> * Convert most usage of Profile to BrowserContext
> * Separate out "master" vs. incognito profiles/contexts
> * Move switches into extensions/common/switches.h
> 
> BUG=313481
> TEST=unit_tests ExtensionProcessManager* and browser_tests ExtensionProcessManager*
> R=miket@chromium.org
> 
> Review URL: https://codereview.chromium.org/52983004

TBR=jamescook@chromium.org

Review URL: https://codereview.chromium.org/47653004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232513 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232513