GitLab

* Check available quota before storing anything
* Inform quota manager of storage updates
* Evict an origin when quota manager requests

BUG=83652
TEST=llvm/Debug/unit_tests --gtest_filter=IndexedDBQuotaClientTest.* && llvm/Debug/browser_tests --gtest_filter=IndexedDBBrowser*

Review URL: http://codereview.chromium.org/7470008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95691 0039d316-1c4b-4281-b951-d872f2087c98