Disable some SignalSenderVerificationTests.

They are flaky.

BUG=785555
TBR=satorux@chromium.org
NOTRY=true

Change-Id: I9e2fbaf9bb1efacc50da6e1b8cd855d379e34568
Reviewed-on: https://chromium-review.googlesource.com/1026560Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553266}

dbus/signal_sender_verification_unittest.cc

@@ -205,7 +205,8 @@ TEST_F(SignalSenderVerificationTest, TestSignalRejected) {
   ASSERT_EQ("", test_signal_string_);
 }
 
-TEST_F(SignalSenderVerificationTest, TestOwnerChanged) {
+// Flaky. https://crbug.com/785555
+TEST_F(SignalSenderVerificationTest, DISABLED_TestOwnerChanged) {
   const char kMessage[] = "hello, world";
 
   // Send the test signal from the exported object.
@@ -253,7 +254,8 @@ TEST_F(SignalSenderVerificationTest, TestOwnerChanged) {
   ASSERT_EQ(kNewMessage, test_signal_string_);
 }
 
-TEST_F(SignalSenderVerificationTest, TestOwnerStealing) {
+// Flaky. https://crbug.com/785555
+TEST_F(SignalSenderVerificationTest, DISABLED_TestOwnerStealing) {
   // Release and acquire the name ownership.
   // latest_name_owner_ should be non empty as |test_service_| owns the name.
   ASSERT_FALSE(latest_name_owner_.empty());