Revert of Disable...

Revert of Disable ClientOnReceivedError2Test#testUserGestureForIframeSubresource test (patchset #1 id:1 of https://codereview.chromium.org/2398513002/ )

Reason for revert:
This test failure was fixed by 64f8e6ee.

Original issue's description:
> Disable ClientOnReceivedError2Test#testUserGestureForIframeSubresource test
>
> BUG=652943
> TBR=michaelbai@chromium.org
>
> Committed: https://crrev.com/163501bc4d0431cf33ddb920af2e1e8fb68606af
> Cr-Commit-Position: refs/heads/master@{#423053}

TBR=michaelbai@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=652943

Review-Url: https://codereview.chromium.org/2395713002
Cr-Commit-Position: refs/heads/master@{#423069}

android_webview/javatests/src/org/chromium/android_webview/test/ClientOnReceivedError2Test.java

@@ -13,7 +13,6 @@ import org.chromium.android_webview.AwContentsClient.AwWebResourceRequest;
 import org.chromium.android_webview.ErrorCodeConversionHelper;
 import org.chromium.android_webview.test.util.AwTestTouchUtils;
 import org.chromium.android_webview.test.util.CommonResources;
-import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Feature;
 import org.chromium.content.browser.test.util.TestCallbackHelperContainer;
 import org.chromium.net.test.util.TestWebServer;
@@ -173,7 +172,6 @@ public class ClientOnReceivedError2Test extends AwTestBase {
 
     @SmallTest
     @Feature({"AndroidWebView"})
-    @DisabledTest(message = "crbug.com/652943")
     public void testUserGestureForIframeSubresource() throws Throwable {
         useDefaultTestAwContentsClient();
         startWebServer();