Disable flaky test #testRightSwipeNavigateForwardOnRenderedPage

TBR=jinsukkim@chromium.org

Bug: 1051221
Change-Id: I57fdf8c492208c2cdd70ac0008c37f921dac450c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050578Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Commit-Queue: Brandon Wylie <wylieb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740473}

chrome/android/javatests/src/org/chromium/chrome/browser/gesturenav/NavigationHandlerTest.java

@@ -146,6 +146,7 @@ public class NavigationHandlerTest {
 
     @Test
     @SmallTest
+    @FlakyTest(message = "crbug.com/1051221")
     public void testRightSwipeNavigateForwardOnRenderedPage() {
         mTestServer = EmbeddedTestServer.createAndStartServer(InstrumentationRegistry.getContext());
         ChromeTabUtils.fullyLoadUrlInNewTab(InstrumentationRegistry.getInstrumentation(),