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This reverts commit 26a7b762.

Reason for revert: Likely caused http://crbug.com/1049486

Original change's description:
> Add Windows high contrast support to the toolbar button icons
> 
> This change adds different foreground icon colors to the toolbar buttons
> for the hovered and pressed states when the high contrast ink drop
> feature is enabled. This is to support the desired platform high contrast
> colors. Future work will add foreground color support to other buttons.
> 
> New theme properties were added to support the additional _HOVERED and
> _PRESSED state high contrast colors. When not in high contrast, these
> are the same as the normal icon color. In high contrast (+ flag) they
> return the selected text HC color. These new colors are used to create
> images in the toolbar buttons for the various button states.
> 
> New helper functions we added to ToolbarButton to simplify setting the
> images for the different button states, including one that just uses
> the standard colors returned by |GetForegroundColor|.
> 
> In the future, we might want to do work to allow icons to be separated
> from colors to allow for easier recoloring.
> 
> Bug: 776871
> Change-Id: Id72d8c60a23889f018044a5fcce7abd9359ad61a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029492
> Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
> Reviewed-by: Peter Kasting <pkasting@chromium.org>
> Commit-Queue: Peter Kasting <pkasting@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#738660}

TBR=pkasting@chromium.org,antrim@chromium.org,johnsm@microsoft.com,champnic@microsoft.com

Change-Id: Ide6174254819728c271a3ed059cee7132cd2c124
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 776871
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040029Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738863}