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This reverts commit 1886f107.

Reason for revert: Looks like this broke the build, e.g.
https://ci.chromium.org/p/chromium/builders/ci/linux-archive-rel/10940
https://ci.chromium.org/p/chromium/builders/ci/Win%20Builder/81787
https://ci.chromium.org/p/chromium/builders/ci/Win%20x64%20Builder/80241

Original change's description:
> Replace .mojom-blink.h with .mojom-blink-forward.h in blink - 7
> 
> To reduce pre-processed size of header files have been including
> foo.mojom-blink.h, this CL replaces .mojom-blink.h with
> .mojom-blink-forward.h in blink header files.
> 
> This CL has no behavior changes and following CLs will
> continue replacing them more.
> 
> Bug: 1001360
> Change-Id: Ic627fb1cb10815ee58ba107a9fa4fc98f5884aa6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844527
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#703686}

TBR=kinuko@chromium.org,tkent@chromium.org,gyuyoung@igalia.com

Change-Id: I62773d78577ee622fee300e3cf5d51de990714ce
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1001360
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847298Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703687}