Send WorkerHostMsg_WorkerConnected in EmbeddedSharedWorkerStub::OnConnect.

WorkerHostMsg_WorkerConnected must be sent in EmbeddedSharedWorkerStub::OnConnect if the SharedWorker is already running.
In current code the memory leak of SharedWorkerConnector could occur because SharedWorkerConnector::connected() is not called.

BUG=327256

Review URL: https://codereview.chromium.org/189413014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256432 0039d316-1c4b-4281-b951-d872f2087c98
DevTools: remove the --remote-debugging-frontend flag.

R=jam@chromium.org, lushnikov@chromium.org, vsevik@chromium.org
TBR=jam (a simple flag removal)

Review URL: https://codereview.chromium.org/189233008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256433 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256433
Add a tutorial for the desktop user manager

This CL makes the tutorial available as a chrome:// url, but not accessible from any native UI. 

Future CLs will:
- add a preference to the profile to show the tutorial the first time the user manager is shown for that profile
- figure out the tutorial positioning in the case there is only one user pod (i.e. show the tutorial to the side, rather than centered, as to not overlap the pod)

BUG=324052
TEST=With --new-profile-management enabled, go to chrome://user-manager#tutorial and become tutorialized.

Review URL: https://codereview.chromium.org/179083003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256434 0039d316-1c4b-4281-b951-d872f2087c98
Add AsyncDNS.NameServersType histogram.

Add a histogram that records how many users are using Google Public DNS, other
public resolver addresses, private resolver addresses, or a mix of the above
for their DNS servers.

BUG=350908

Review URL: https://codereview.chromium.org/187673005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256435 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256435