Mark org.chromium.android_webview.test.ClientOnPageFinishedTest#testPassesCorrectUrl flaky

BUG=672885
TBR=boliu@chromium.org

Review-Url: https://codereview.chromium.org/2568413003
Cr-Commit-Position: refs/heads/master@{#438190}

android_webview/javatests/src/org/chromium/android_webview/test/ClientOnPageFinishedTest.java

@@ -39,6 +39,7 @@ public class ClientOnPageFinishedTest extends AwTestBase {
 
     @MediumTest
     @Feature({"AndroidWebView"})
+    @FlakyTest(message = "crbug.com/672885")
     public void testPassesCorrectUrl() throws Throwable {
         TestCallbackHelperContainer.OnPageFinishedHelper onPageFinishedHelper =
                 mContentsClient.getOnPageFinishedHelper();