Disable PostMessageTest#testMessageChannelUsingPendingPort because flaky

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

Index: android_webview/javatests/src/org/chromium/android_webview/test/PostMessageTest.java
diff --git a/android_webview/javatests/src/org/chromium/android_webview/test/PostMessageTest.java b/android_webview/javatests/src/org/chromium/android_webview/test/PostMessageTest.java
index 47630423e0112129dfba38e5a7fc04bd6e0fffc0..7a433a6560a7d70945fd68a5e6707746cada3dc8 100644
--- a/android_webview/javatests/src/org/chromium/android_webview/test/PostMessageTest.java
+++ b/android_webview/javatests/src/org/chromium/android_webview/test/PostMessageTest.java
@@ -677,8 +677,10 @@ public class PostMessageTest extends AwTestBase {
     // transferred to JS and full communication can happen on it.
     // Do this by sending a message to JS and let it echo'ing the message with
     // some text prepended to it.
-    @SmallTest
-    @Feature({"AndroidWebView", "Android-PostMessage"})
+    // Disabled because flaky, see crbug.com/715960.
+    // @SmallTest
+    // @Feature({"AndroidWebView", "Android-PostMessage"})
+    @DisabledTest
     public void testMessageChannelUsingPendingPort() throws Throwable {
         final ChannelContainer channelContainer = new ChannelContainer();
         loadPage(ECHO_PAGE);