Disable all ActivityLogger tests, they're flaky

These caused the last Blink roll to be reverted:
http://src.chromium.org/viewvc/chrome?view=rev&revision=280864

NOTRY=true
BUG= 388287

Review URL: https://codereview.chromium.org/366723002

git-svn-id: svn://svn.chromium.org/blink/trunk@177340 bbb929c8-8fbe-4397-9dbb-9b2b20218538