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This reverts commit 6a44a630.

Reason for revert: these tests are still failing on Android FYI bots. https://ci.chromium.org/p/chromium/builders/ci/Android%20FYI%20Release%20%28Nexus%205%29/19007

Original change's description:
> Add viewport metadata tag to pixel video tests.
> 
> 1. Add viewport metadata tag to the pixel video tests since they are run on
> mobile devices(android). Without this tag, the webpages are not scaled
> as expected according to device pixel ratio and hence was failing to match
> color expectations.
> 
> 2. This CL fixed 3 tests - Pixel_Video_MP4,
> Pixel_Video_MP4_FourColors_Aspect_4x3 and Pixel_Video_MP4_FourColors_Rot_180.
> 
> Bug: 925744
> Change-Id: I5dac913b158146f69c6b539d99fb386c3162eb8e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1698981
> Reviewed-by: Zhenyao Mo <zmo@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Commit-Queue: vikas soni <vikassoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#676650}

TBR=zmo@chromium.org,kbr@chromium.org,vikassoni@chromium.org

Change-Id: I73c25b707513ecd73e007a6942d82eb343d2fbd0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 925744
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700162Reviewed-by: Saman Sami <samans@chromium.org>
Commit-Queue: Saman Sami <samans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676894}