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This reverts commit 14aa2e0e.

Reason for revert:
<select> tags non-functional (both web and chrome:// pages).
See http://crbug.com/776548

Original change's description:
> Fix crash with MojoInputMessages
> 
> Once WillShutdown is called the InputHandlerProxy object should be destroyed
> since it is no longer valid.
> 
> BUG=775483
> 
> Change-Id: I3dc1cf7d7295ff08bbcec3d8ee2b12690961af2e
> Reviewed-on: https://chromium-review.googlesource.com/725860
> Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
> Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#509894}

TBR=dtapuska@chromium.org,mustaq@chromium.org

Change-Id: I7e8f0d3f6a8e41acf12bda09993aac1b2cbfccf3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 775483
Reviewed-on: https://chromium-review.googlesource.com/729206Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510232}