Build the latest stable channel release of Chromium

vendor/chromium/.gclient specifies which release to build. By building
from the stable channel we can hopefully avoid bugs that Google never
ships to customers, at the expense of some modernity.
Update custom_deps to match latest recommendations

These came from http://dev.chromium.org/developers/how-tos/get-the-code
Fix DomStorageHost patch to apply against Chrome 27
Remove patches that aren't needed for Chrome 27

We'll probably need to re-add these when we upgrade to Chrome 28.
Revert "Stop trying to compile SQLitePersistentCookieStore separately"

This reverts commit 0d607ee56be77990ba3a929aa4016c1633bad208.

Conflicts:
	chromiumcontent.gyp
	script/create-dist
Pull in the fix for http://crbug.com/234342