Disabled flaky ToolbarButtonIphTest

This CL Disables the following test:
* ToolbarButtonIphTest#testTabSwitcherButtonIph

Because it's flaky on the following builder:
* android-pie-x86-rel

TBR=mdjones@chromium.org

Bug: 1144263
Change-Id: I3d935f8e0ce12c09222f60e6ac28214c0c93cfca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510873Reviewed-by: Salvador Guerrero <salg@google.com>
Commit-Queue: Salvador Guerrero <salg@google.com>
Cr-Commit-Position: refs/heads/master@{#822801}

chrome/android/javatests/src/org/chromium/chrome/browser/toolbar/top/ToolbarButtonIphTest.java

@@ -34,6 +34,7 @@ import org.mockito.MockitoAnnotations;
 
 import org.chromium.base.Callback;
 import org.chromium.base.test.util.CommandLineFlags;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Restriction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.feature_engagement.TrackerFactory;
@@ -120,6 +121,7 @@ public class ToolbarButtonIphTest {
 
     @Test
     @MediumTest
+    @DisabledTest(message = "https://crbug.com/1144263")
     @Restriction({UiRestriction.RESTRICTION_TYPE_PHONE})
     public void testTabSwitcherButtonIph() {
         when(mTracker.shouldTriggerHelpUI(FeatureConstants.TAB_SWITCHER_BUTTON_FEATURE))