Remove the unneccesary storage of labels in MediaStreamDispatcherHost.
Instead, the MediaStreamManager provide the request ids in its callbacks.

BUG=316396

Review URL: https://codereview.chromium.org/102123005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240668 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240668
cr: Handle Ctrl-C more gracefully

Instead of freaking out with a Python stack trace when the user hits
Ctrl-C while a subprocess is running, just terminate the child process
and exit quietly.

TEST=cr build chrome # Ctrl-C -> "ninja: build stopped: interrupted by user."
NOTRY=true

Review URL: https://codereview.chromium.org/115123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240669 0039d316-1c4b-4281-b951-d872f2087c98
Revert 239894 "Linux Sandbox: check no threads before fork()."

BUG=327241, 328249

> Linux Sandbox: check no threads before fork().
> 
> Always check that no threads are running before fork().
> 
> BUG=327241
> NOTRY=true
> 
> Review URL: https://codereview.chromium.org/108173008

TBR=jln@chromium.org

Review URL: https://codereview.chromium.org/106903012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240670 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240670