Disable flaky tests in org.chromium.weblayer.test.NavigationTest

This CL disables the following tests:
* org.chromium.weblayer.test.NavigationTest
** testWebResponseCachedWithSniffedMimeType
** testWebResponseCached

Because they are flaky on builder:
* "Marshmallow 64 bit Tester"

TBR=estade@chromium.org

Bug: 1144246
Change-Id: I7bd528e78cdab0ee898892d2c3c9f5600749d206
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510910
Commit-Queue: Salvador Guerrero <salg@google.com>
Reviewed-by: Salvador Guerrero <salg@google.com>
Cr-Commit-Position: refs/heads/master@{#822767}

weblayer/browser/android/javatests/src/org/chromium/weblayer/test/NavigationTest.java

@@ -26,6 +26,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.chromium.base.test.util.CallbackHelper;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.content_public.browser.test.util.Criteria;
 import org.chromium.content_public.browser.test.util.CriteriaHelper;
 import org.chromium.content_public.browser.test.util.TestThreadUtils;
@@ -995,6 +996,7 @@ public class NavigationTest {
 
     @Test
     @SmallTest
+    @DisabledTest(message = "https://crbug.com/1144246")
     @MinWebLayerVersion(87)
     public void testWebResponseCached() throws Exception {
         InstrumentationActivity activity = mActivityTestRule.launchShellWithUrl(URL1);
@@ -1014,6 +1016,7 @@ public class NavigationTest {
 
     @Test
     @SmallTest
+    @DisabledTest(message = "https://crbug.com/1144246")
     @MinWebLayerVersion(87)
     public void testWebResponseCachedWithSniffedMimeType() throws Exception {
         InstrumentationActivity activity = mActivityTestRule.launchShellWithUrl(URL1);