Renable TouchActionBrowserTest.DefaultAuto

The test was disabled a year and a half ago due to flakiness. I cannot
reproduce it anymore.

BUG=376668

Change-Id: I7b6c99187f9ce53af2252dfe95e0b68da322af98
Reviewed-on: https://chromium-review.googlesource.com/922341Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537338}

content/browser/renderer_host/input/touch_action_browsertest.cc

@@ -184,11 +184,15 @@ class TouchActionBrowserTest : public ContentBrowserTest {
 // Mac doesn't yet have a gesture recognizer, so can't support turning touch
 // events into scroll gestures.
 // Will be fixed with http://crbug.com/337142
-// Flaky on all platforms: https://crbug.com/376668
+#if defined(OS_MACOSX)
+#define MAYBE_DefaultAuto DISABLED_DefaultAuto
+#else
+#define MAYBE_DefaultAuto DefaultAuto
+#endif
 //
 // Verify the test infrastructure works - we can touch-scroll the page and get a
 // touchcancel as expected.
-IN_PROC_BROWSER_TEST_F(TouchActionBrowserTest, DISABLED_DefaultAuto) {
+IN_PROC_BROWSER_TEST_F(TouchActionBrowserTest, MAYBE_DefaultAuto) {
   LoadURL();
 
   bool scrolled = DoTouchScroll(gfx::Point(50, 50), gfx::Vector2d(0, 45), true);