Sheriff: Disable flaky test KeyboardAccessTest.BackForwardKeys

TBR=sky@chromium.org

Bug: 846623
Change-Id: I2c9f73bc25eb0b9927591c3012351154525d0ca5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810142Reviewed-by: Fergus Dall <sidereal@google.com>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#697455}

chrome/browser/ui/views/keyboard_access_browsertest.cc

@@ -484,13 +484,8 @@ IN_PROC_BROWSER_TEST_F(KeyboardAccessTest, ReserveKeyboardAccelerators) {
 }
 
 #if defined(OS_WIN)  // These keys are Windows-only.
-// Disabled on debug due to high flake rate; see https://crbug.com/846623.
-#if !defined(NDEBUG)
-#define MAYBE_BackForwardKeys DISABLED_BackForwardKeys
-#else
-#define MAYBE_BackForwardKeys BackForwardKeys
-#endif
-IN_PROC_BROWSER_TEST_F(KeyboardAccessTest, MAYBE_BackForwardKeys) {
+// Disabled due to high flake rate; see https://crbug.com/846623.
+IN_PROC_BROWSER_TEST_F(KeyboardAccessTest, DISABLED_BackForwardKeys) {
   // Navigate to create some history.
   ui_test_utils::NavigateToURL(browser(), GURL("chrome://version/"));
   ui_test_utils::NavigateToURL(browser(), GURL("chrome://about/"));