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This reverts commit 358ed727.

Reason for revert:  Speculative fix didn't fix crashes. See bug for details.

Original change's description:
> Define toolbar button height and width in-line instead of in styles.xml
> 
> Define the layout_height and layout_width for ToolbarButton elements
> in-line rather than in styles.xml. This is a speculative fix for crash
> reports we've received indicating these attributes are missing.
> 
> BUG=779271
> 
> Change-Id: I732ee9b39262aa8bfbc74dea57ea72469cd9e647
> Reviewed-on: https://chromium-review.googlesource.com/764378
> Commit-Queue: Theresa <twellington@chromium.org>
> Reviewed-by: Ted Choc <tedchoc@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#515966}

TBR=tedchoc@chromium.org,twellington@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 779271
Change-Id: I60d3e400fc77f51c098ebb282e6d037f8242fb9c
Reviewed-on: https://chromium-review.googlesource.com/794011Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519706}