Disable all the browser_tests that are flaking more than 5% of the time on trybots.

chrome/browser/chromeos/extensions/virtual_keyboard_browsertest.cc

Index: chrome/browser/chromeos/extensions/virtual_keyboard_browsertest.cc
diff --git a/chrome/browser/chromeos/extensions/virtual_keyboard_browsertest.cc b/chrome/browser/chromeos/extensions/virtual_keyboard_browsertest.cc
index 1f0104d416310d1ff0262230d075851f220470ac..361789f4e4187b115e4a6c76e3f105ef0cd5791f 100644
--- a/chrome/browser/chromeos/extensions/virtual_keyboard_browsertest.cc
+++ b/chrome/browser/chromeos/extensions/virtual_keyboard_browsertest.cc
@@ -143,7 +143,9 @@ IN_PROC_BROWSER_TEST_F(VirtualKeyboardBrowserTest, HideKeyboardKeyTest) {
           VirtualKeyboardBrowserTestConfig());
 }
 
-IN_PROC_BROWSER_TEST_F(VirtualKeyboardBrowserTest, KeysetTransitionTest) {
+// http://crbug.com/396326
+IN_PROC_BROWSER_TEST_F(VirtualKeyboardBrowserTest,
+                       DISABLED_KeysetTransitionTest) {
   RunTest(base::FilePath(FILE_PATH_LITERAL("keyset_transition_test.js")),
           VirtualKeyboardBrowserTestConfig());
 }