Clean up clipboard state in EditUrlSuggestionUnitTest

EditUrlSuggestionUnitTest was leaking native clipboard state that was
causing other clipboard tests to fail. Test grouping on M vs R revealed
this dependency locally, but not on the bots.

Change-Id: I98bed04aae3fa69dc82bb7a74856c37d75b6106a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353389Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797482}

chrome/android/BUILD.gn

@@ -1148,6 +1148,7 @@ android_library("chrome_test_java") {
     "//third_party/junit",
     "//third_party/mockito:mockito_java",
     "//third_party/ub-uiautomator:ub_uiautomator_java",
+    "//ui/android:clipboard_java_test_support",
     "//ui/android:ui_java",
     "//ui/android:ui_java_test_support",
     "//ui/android:ui_javatests",

chrome/android/javatests/src/org/chromium/chrome/browser/omnibox/suggestions/editurl/EditUrlSuggestionUnitTest.java

@@ -49,6 +49,7 @@ import org.chromium.components.search_engines.TemplateUrlService;
 import org.chromium.content_public.browser.test.NativeLibraryTestUtils;
 import org.chromium.content_public.browser.test.util.TestThreadUtils;
 import org.chromium.ui.base.Clipboard;
+import org.chromium.ui.base.ClipboardAndroidTestSupport;
 import org.chromium.ui.modelutil.PropertyModel;
 import org.chromium.url.GURL;
 
@@ -156,6 +157,7 @@ public final class EditUrlSuggestionUnitTest {
         TestThreadUtils.runOnUiThreadBlocking(() -> {
             Clipboard.getInstance().overrideClipboardManagerForTesting(mOldClipboardManager);
         });
+        ClipboardAndroidTestSupport.cleanup();
     }
 
     /** Test that the suggestion is triggered. */