Remove --enable-memory-info flag

Chrome exposes quantized rate-limited information about memory through
'window.performance.memory'. This should be enough for the majority of web
developers. Developers who need more detailed data can use tools like Telemetry
to obtain JS heap size status via DevTools remote debugging protocol.

BUG=350339
TBR=palmer@chromium.org

Review URL: https://codereview.chromium.org/192653002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256807 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256807
Move clients of BrowserContextKeyedService to use KeyedService

The moved clients are the ones in:
- //chrome/browser/signin
- //chrome/browser/sync
- //chrome/browser/ui

BUG=351704
TBR=jochen

Review URL: https://codereview.chromium.org/197473005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256808 0039d316-1c4b-4281-b951-d872f2087c98
Keep VectorCanvas as a typedef of PlatformCanvas

It does not extend PlatformCanvas, but current callers will (soon) need
to be changed to use SkDocument, so leaving VectorCanvas as a typedef
for now so I have a bread-crumb trail to follow.

NOTRY=True

Review URL: https://codereview.chromium.org/197823005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256809 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256809