Disable RenderWidgetHostBrowserTest.GetSnapshotFromRendererTest on aura.

This test is not possible with ubercomp, which is always on in aura.
So disable the test. It should just go away entirely once all platforms
are using ubercomp.

R=piman
BUG=272379,270918

Review URL: https://codereview.chromium.org/132963006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245587 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/render_widget_host_browsertest.cc

@@ -46,9 +46,9 @@ class RenderWidgetHostBrowserTest : public ContentBrowserTest {
   base::FilePath test_dir_;
 };
 
-// Disabled on Windows and CrOS because it is flaky: crbug.com/272379.
 // Disabled on Ozone due to flake: crbug.com/315392.
-#if defined(OS_WIN) || defined(OS_CHROMEOS) || defined(USE_OZONE)
+// Disabled on Aura since this is not possible with ubercomp.
+#if defined(USE_AURA) || defined(USE_OZONE)
 #define MAYBE_GetSnapshotFromRendererTest DISABLED_GetSnapshotFromRendererTest
 #else
 #define MAYBE_GetSnapshotFromRendererTest GetSnapshotFromRendererTest