DescriptionFix crash on win_aura buildbot because a RootWindow was getting multiple AddRootWindowObserver calls for the same window. The issue is that the observer wasn't unregistering itself at destruction. If another one happened to be created at the same memory address, then this check would trigger.
BUG=163506
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=170584
Patch Set 1 #Patch Set 2 : check RootWindow before using it #Messages
Total messages: 1 (0 generated)
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