Disable flaky test SelectionThenPinchInOOPIF.

This test is flaking a lot on Android now.  Disabling.

TBR=wjmaclean@chromium.org

BUG=906204, 897173

Change-Id: I4226c043de09fd5cb6fd83343bbfac5b69a802d4
Reviewed-on: https://chromium-review.googlesource.com/c/1341140
Commit-Queue: Donn Denman <donnd@chromium.org>
Reviewed-by: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609060}

content/browser/site_per_process_browsertest.cc

@@ -10671,8 +10671,13 @@ IN_PROC_BROWSER_TEST_F(TouchSelectionControllerClientAndroidSiteIsolationTest,
 
 // This test verifies that the handles associated with an active touch selection
 // are still correctly positioned after a pinch-zoom operation.
+#if defined(OS_ANDROID)  // Flaky on Android.  See https://crbug.com/906204.
+#define MAYBE_SelectionThenPinchInOOPIF DISABLED_SelectionThenPinchInOOPIF
+#else
+#define MAYBE_SelectionThenPinchInOOPIF SelectionThenPinchInOOPIF
+#endif
 IN_PROC_BROWSER_TEST_F(TouchSelectionControllerClientAndroidSiteIsolationTest,
-                       SelectionThenPinchInOOPIF) {
+                       MAYBE_SelectionThenPinchInOOPIF) {
   // Load test URL with cross-process child.
   SetupTest();