Disable flaky FlingControllerTest

FlingControllerTest.EarlyTouchscreenFlingCancelationOnFlingStop is
flaky.

Bug: 886992, 836996
Change-Id: I80a732f729ee8691a18ea7948c78cb1c9eb54a01
Reviewed-on: https://chromium-review.googlesource.com/1234976Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Asanka Herath <asanka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592546}

content/browser/renderer_host/input/fling_controller_unittest.cc

@@ -380,7 +380,9 @@ TEST_P(FlingControllerTest, DISABLED_EarlyTouchpadFlingCancelationOnFlingStop) {
   EXPECT_EQ(0.f, last_sent_wheel_.delta_y);
 }
 
-TEST_P(FlingControllerTest, EarlyTouchscreenFlingCancelationOnFlingStop) {
+// Flaky. https://crbug.com/886992
+TEST_P(FlingControllerTest,
+       DISABLED_EarlyTouchscreenFlingCancelationOnFlingStop) {
   base::TimeTicks progress_time = base::TimeTicks::Now();
   SimulateFlingStart(blink::kWebGestureDeviceTouchscreen,
                      gfx::Vector2dF(1000, 0));