Fixes for browser finder unittests on cros.

These tests don't succeed because of desktop_browser_finder.CanFindAvailableBrowsers:
https://code.google.com/p/chromium/codesearch#chromium/src/tools/telemetry/telemetry/core/backends/chrome/desktop_browser_finder.py&q=CanFindAvailableBrowsers&l=84

BUG=331940
TEST=manual

Review URL: https://codereview.chromium.org/135063003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244424 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244424
Undo the mistake of early return in GetFaviconResourceBytes.

When trying to enable chrome://components for Android "return NULL;" was
accidentally moved together with the if check resulting in an early return.

Breaking CL https://codereview.chromium.org/112673008

BUG=332714

Review URL: https://codereview.chromium.org/135113002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244425 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244425