Disable flaky ConnectionTests.

Example failure:

https://ci.chromium.org/p/chromium/builders/ci/Win10%20Tests%20x64/50702

TBR=joedow@google.com

Bug: 1143671
Change-Id: I16cd36a9f8edaad8b02a78d2170b30107e878800
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506442Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822158}

remoting/protocol/connection_unittest.cc

@@ -650,7 +650,9 @@ TEST_P(ConnectionTest, MAYBE_Audio) {
   client_audio_player_.Verify();
 }
 
-TEST_P(ConnectionTest, FirstCaptureFailed) {
+// Flaky on multiple platforms
+// https://crbug.com/1143671
+TEST_P(ConnectionTest, DISABLED_FirstCaptureFailed) {
   Connect();
 
   auto capturer = std::make_unique<TestScreenCapturer>();
@@ -660,7 +662,9 @@ TEST_P(ConnectionTest, FirstCaptureFailed) {
   WaitNextVideoFrame();
 }
 
-TEST_P(ConnectionTest, SecondCaptureFailed) {
+// Flaky on multiple platforms
+// https://crbug.com/1143671
+TEST_P(ConnectionTest, DISABLED_SecondCaptureFailed) {
   Connect();
 
   auto capturer = std::make_unique<TestScreenCapturer>();