Removed requirement for the renderer to know it's process ID

Process ID is now patched into the latency info once it reaches the browser process

BUG=333501

Review URL: https://codereview.chromium.org/140663003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246149 0039d316-1c4b-4281-b951-d872f2087c98
Remove stale comment referring to Chrome Frame.

BUG=316496
R=dgrogan@chromium.org,jam@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/143443003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246151 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246151