Fix OpenDevice call from Pepper.

When OpenDevice is called with non-empty string for device id and that device doesn't exist (e.g., unplugged),
failure should be returned, instead of falling back to default device.

R=xhwang@chromium.org, yzshen@chromium.org

Review URL: https://codereview.chromium.org/24170005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225082 0039d316-1c4b-4281-b951-d872f2087c98
Setup an OWNERS file for mojo. Apologies if I've missed anyone.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/24250010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225083 0039d316-1c4b-4281-b951-d872f2087c98
Update offline page on ChromeOS to match standard error page.

BUG=263913
R=dpolukhin@chromium.org, thakis@chromium.org, xiyuan@chromium.org

Review URL: https://codereview.chromium.org/23513067

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225084 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225084