Deflake two more tests for preload=metadata lazy load.

BUG=879406,969079
TBR=liberato

Change-Id: Icdc2bc65226bce07331f56311d244e6c2212c551
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637593Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665192}

third_party/blink/web_tests/media/color-profile-video.html

@@ -19,7 +19,7 @@
     1) the final colored blocks in the series of colored blocks in the
        video content box area are respectively: cyan, blue, green
     2) the video seek point is near 00:000:00.00 -->
-  <video/>
+  <video preload="auto"/>
 </body>
 
 <script>

third_party/blink/web_tests/media/controls/overflow-menu-always-visible.html

@@ -12,7 +12,7 @@
     width: 60px;
   }
 </style>
-<video controls muted></video>
+<video controls muted preload="auto"></video>
 <script>
   if (window.testRunner)
     testRunner.waitUntilDone();