Mark waterfall-images.html as failure

Per request here: http://crbug.com/714166

R=dgozman
BUG=714166,715405

Review-Url: https://codereview.chromium.org/2850923002
Cr-Commit-Position: refs/heads/master@{#468431}

third_party/WebKit/LayoutTests/TestExpectations

@@ -3366,7 +3366,8 @@ crbug.com/713509 crypto/subtle/worker-subtle-crypto-concurrent.html [ Pass Timeo
 crbug.com/713685 [ Linux ] fast/workers/termination-early.html [ Crash Pass ]
 crbug.com/713685 [ Linux ] virtual/sharedarraybuffer/fast/workers/termination-early.html [ Crash Pass ]
 
-crbug.com/715405 [ Win Mac ] virtual/mojo-loading/http/tests/inspector/network/waterfall-images.html [ Failure Pass ]
+crbug.com/715405 virtual/mojo-loading/http/tests/inspector/network/waterfall-images.html [ Skip ]
+crbug.com/714166 http/tests/inspector/network/waterfall-images.html [ Skip ]
 
 crbug.com/715718 external/wpt/media-source/mediasource-activesourcebuffers.html [ Failure Pass ]
 crbug.com/715718 external/wpt/media-source/mediasource-remove.html [ Failure Pass ]