[Telemetry] Disable dom_perf on Android because it times out.

Linux is a casualty because we currently don't have a clean system to
differentiate the platforms.

TBR=tonyg@chromium.org
NOTRY=True
BUG=

Review URL: https://codereview.chromium.org/101043002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238298 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238298