Disable InputHandlerManagerDestroyedAfterCompositorThread on Windows

The test RenderThreadImplBrowserTest.InputHandlerManagerDestroyedAfterCompositorThread
is flaky on Windows, with first obvservation being
https://build.chromium.org/p/chromium.win/builders/Win%207%20Tests%20x64%20%281%29/builds/24771

BUG=728034
TBR=skyostil@chromium.org

Change-Id: Icf3a073407eb8eaa13c111987544d887bcac68ca
Reviewed-on: https://chromium-review.googlesource.com/518822Reviewed-by: Henrik Kjellander <kjellander@chromium.org>
Commit-Queue: Henrik Kjellander <kjellander@chromium.org>
Cr-Commit-Position: refs/heads/master@{#475839}

content/renderer/render_thread_impl_browsertest.cc

@@ -269,8 +269,16 @@ void CheckRenderThreadInputHandlerManager(RenderThreadImpl* thread) {
 // Check that InputHandlerManager outlives compositor thread because it uses
 // raw pointers to post tasks.
 // Disabled under LeakSanitizer due to memory leaks. http://crbug.com/348994
+// Disabled on Windows due to flakiness: http://crbug.com/728034.
+#if defined(OS_WIN)
+#define MAYBE_InputHandlerManagerDestroyedAfterCompositorThread \
+  DISABLED_InputHandlerManagerDestroyedAfterCompositorThread
+#else
+#define MAYBE_InputHandlerManagerDestroyedAfterCompositorThread \
+  InputHandlerManagerDestroyedAfterCompositorThread
+#endif
 TEST_F(RenderThreadImplBrowserTest,
-       WILL_LEAK(InputHandlerManagerDestroyedAfterCompositorThread)) {
+       WILL_LEAK(MAYBE_InputHandlerManagerDestroyedAfterCompositorThread)) {
   ASSERT_TRUE(thread_->input_handler_manager());
 
   thread_->compositor_task_runner()->PostTask(