Disabling app activity proxy location test.

BUG=416843
TBR=oshima@chromium.org

Review URL: https://codereview.chromium.org/594853002

Cr-Commit-Position: refs/heads/master@{#296174}

athena/content/app_activity_unittest.cc

@@ -310,7 +310,8 @@ TEST_F(AppActivityTest, TestUnloadFollowedByClose) {
 
 // Test that when unloading an app while multiple apps / activities are present,
 // the proxy gets created in the correct location.
-TEST_F(AppActivityTest, TestUnloadProxyLocation) {
+// Flaky: http://crbug.com/416843.
+TEST_F(AppActivityTest, DISABLED_TestUnloadProxyLocation) {
   // Set up some activities for some applications.
   TestAppActivity* app_activity1a = CreateAppActivity(kDummyApp1);
   TestAppActivity* app_activity2a = CreateAppActivity(kDummyApp2);