Revert of Apply image transformation for thumbnails loaded by loadDetachedImage.

Revert of Apply image transformation for thumbnails loaded by loadDetachedImage. (patchset #4 id:60001 of https://codereview.chromium.org/2630283002/ )

Reason for revert:
crbug.com/682139

Original issue's description:
> Apply image transformation for thumbnails loaded by loadDetachedImage.
> 
> This change will fix 2 parts where we had wrong image orientation,
> when there's EXIF image rotation/transfomration info.
> 1. Tooltip thumbnail when an image is dragged in Files app.
> 2. Low-density image tentatively shown in Gallery app.
> 
> The drag thumbnail is changed to use the CANVAS mode,
> because the IMAGE mode still doesn't work correctly.
> 
> BUG=680420, 680414
> TEST=browser_tests --gtest_filter=FileManagerJsTest.ThumbnailLoader
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
> 
> Review-Url: https://codereview.chromium.org/2630283002
> Cr-Commit-Position: refs/heads/master@{#443875}
> Committed: https://chromium.googlesource.com/chromium/src/+/b1a8ea6390809eb8e166631a05eaf97406baf6ca

TBR=oka@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=680420, 680414

[yamaguchi, 2017-01-18 07:50:13]

Created Revert of Apply image transformation for thumbnails loaded by
loadDetachedImage.

[yamaguchi, 2017-01-18 12:42:43]

On 2017/01/18 07:50:13, yamaguchi wrote:
> Created Revert of Apply image transformation for thumbnails loaded by
> loadDetachedImage.

I will abandon this revert patch, because the original patch turned out not to
be the cause of the issue.