Removes some deadcode in RenderThreadImplBrowserTest

There is a test that is already removed, the code for disabling the
test is still there. This CL removes the code that disabling the test.

Bug: 728034
Change-Id: I47a6c3e98e8fee64ad776e4ff2c230d0f2733a1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488121Reviewed-by: Yi Gu <yigu@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819157}

content/renderer/render_thread_impl_browsertest.cc

@@ -266,18 +266,6 @@ class RenderThreadImplBrowserTest : public testing::Test,
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImplBrowserTest);
 };
 
-// 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
-
 // Disabled under LeakSanitizer due to memory leaks.
 TEST_F(RenderThreadImplBrowserTest,
        WILL_LEAK(NonResourceDispatchIPCTasksDontGoThroughScheduler)) {