Disable remaining test on Mac that is flaking more than 5%.

chrome/browser/ui/cocoa/browser_window_controller_unittest.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_unittest.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_unittest.mm b/chrome/browser/ui/cocoa/browser_window_controller_unittest.mm
index 0af185155d892fd26827375f066e4c1a507eb179..269fa15452d942bbc1d5099e04a45ca9ddb85bcb 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_unittest.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_unittest.mm
@@ -846,7 +846,8 @@ TEST_F(BrowserWindowFullScreenControllerTest, TestFullscreen) {
 // problem (such as a modal dialog up).  This tests is a very useful canary, so
 // please do not mark it as flaky without first verifying that there are no bot
 // problems.
-TEST_F(BrowserWindowFullScreenControllerTest, TestActivate) {
+// http://crbug.com/53586
+TEST_F(BrowserWindowFullScreenControllerTest, DISABLED_TestActivate) {
   [controller_ showWindow:nil];
 
   EXPECT_FALSE([controller_ isFullscreen]);