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It's apparently possible for
BrowserList::SetLastActive(Browser* browser) to be called before
|browser| is added to the BrowserList. This might happen, e.g., if a
BrowserView's widget receives an activation event before
CreateBrowserWindow() returns.

This will cause WindowActivityWatcher's UpdateMetrics() helper function
to dereference the null pointer at browser->window().

Bug: 811243,811191
Change-Id: Ia377a810b73494f88d1cd2b4532367950f35b1f7
Reviewed-on: https://chromium-review.googlesource.com/924353
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537825}