Modify fileAtPath stat to track if the call was redirected by chrome_elf.

TEST=Manual: Start chrome.exe, wait ~60s and check chrome://histograms, the Stability.FileAtPath metric should have run (at least) once, and the resulting value should be 6, assuming the check succeeded.

Review URL: https://codereview.chromium.org/169093007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253251 0039d316-1c4b-4281-b951-d872f2087c98
Mojo: Remove MessagePipeEndpoint::EnqueueMessage()'s return value.

The new semantics are that it must succeed. (Next, pending another CL that moves
the Dispatchers into the MessageInTransit itself: move the attaching of
dispatchers "up" the stack into message_pipe.cc.)

R=davemoore@chromium.org

Review URL: https://codereview.chromium.org/180133004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253252 0039d316-1c4b-4281-b951-d872f2087c98
Fix typo in mediaGalleries.addScanResults documentation.

TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/179003002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253253 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253253