disable failing testLoadFlagsWithConnectionMigration

TBR=mef@chromium.org

Bug: 830707
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester
Change-Id: I455fb0013d65ca3d2c44d5e2b28dfd977ff61aa3
Reviewed-on: https://chromium-review.googlesource.com/1003114
Commit-Queue: Helen Li <xunjieli@chromium.org>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549235}

components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestTest.java

@@ -210,6 +210,7 @@ public class CronetUrlRequestTest {
     /**
      * Tests that disabling connection migration sets the URLRequest load flag correctly.
      */
+    @DisabledTest(message = "crbug.com/830707")
     @Test
     @SmallTest
     @Feature({"Cronet"})