Revert 244229 "base: Fix registering of memory pressure listener..."

Causing webkit_unit_tests to fail.

> base: Fix registering of memory pressure listeners used when emulating discardable memory.
> 
> Memory pressure listeners need to be created on a thread with a message
> loop current. Discardable memory is often used on worker threads that
> don't have a message loop and with the current system where listeners
> are registered on first use, the result is that we're most likely never
> notified of memory pressure.
> 
> This adds a function to the discardable memory interface that allows us
> to register memory pressure listeners on a thread, and at a time, when
> we know a message loop is current.
> 
> BUG=332570
> TBR=jamesr@chromium.org
> 
> Review URL: https://codereview.chromium.org/129963002

TBR=reveman@chromium.org

Review URL: https://codereview.chromium.org/135113003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244278 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244278
Whitelist internal bookmarks manager for chrome_settings_overrides manifest key

Allow the Chrome-internal bookmarks manager extensions to specify
the chrome_settings_overrides manifest key in all channels, so that
they can use the bookmarks_ui subkey. Specifying subkey channels in
manifest_features.json would be better, but this is not fully supported
yet.

BUG=333362
R=kalman@chromium.org

Review URL: https://codereview.chromium.org/134843002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244279 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244279
Add nacl sdk builders to default try list.

These are the new "build-only" builders for that
NaCl SDK which should be fast and reliable and
catch basic build breaks.

BUG=302579

Review URL: https://codereview.chromium.org/26747002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244280 0039d316-1c4b-4281-b951-d872f2087c98
Add getUserMedia info to the dump and add browser tests.

BUG= 304023

Review URL: https://codereview.chromium.org/129833002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244281 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244281