Disable BottomToolbarTest causing build bot failures.

Bug: 1009145, 1009146
TBR=twellington@chromium.org

Change-Id: I8211bcc1dcf78da8b9782f421ad962da051c7e9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1830328Reviewed-by: Ender <ender@google.com>
Commit-Queue: Ender <ender@google.com>
Auto-Submit: Ender <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#700940}

chrome/android/javatests/src/org/chromium/chrome/browser/toolbar/bottom/BottomToolbarTest.java

@@ -16,6 +16,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 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.ChromeActivity;
@@ -52,6 +53,7 @@ public class BottomToolbarTest {
     }
 
     @Test
+    @DisabledTest
     @MediumTest
     public void testBottomToolbarVisibility() {
         Assert.assertNotNull("BottomToolbarCoordinator should be constructed.",
@@ -63,6 +65,7 @@ public class BottomToolbarTest {
     }
 
     @Test
+    @DisabledTest
     @MediumTest
     public void testBottomToolbarTabSwitcherButton() throws ExecutionException {
         Assert.assertFalse("Tab switcher should not be visible.",