Fix up rowbytes vs. width desynchronization, and fix failure to initialize entire bitmap memory. To fix up the rowbytes value properly, we simply don't send it via IPC any more, and recalulate it from width and depth in the trusted code. It's a cheap calculation.

      Also one bonus fix: don't use an unintialized IconInfo if deserialization fails.

BUG=31307
TEST=Manual; ran with breakpoints on the failure paths.

Review URL: http://codereview.chromium.org/517023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35371 0039d316-1c4b-4281-b951-d872f2087c98