Web MIDI: add kDumpRenderTree flag check to ShellBrowserContext::RequestMIDI...

content_shell should work with full features if it runs without the
kDumpRenderTree flag.

BUG=163795, 257618
TBR=jam@chromium.org
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/19980004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@213077 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed