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This reverts commit fd493b4b.

Reason for revert: Broken build: https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win%20x64%20Builder%20%28dbg%29/builds/114259

Original change's description:
> Stop building SkCodec
> 
> Bug: 768878
> 
> Building SkCodec seems to have caused a paint regression on a webpage
> without any images. This leads us to suspect "some minor compiler
> optimization tickling". Stop building it to confirm. Two CLs rely on
> SkCodec:
> 
> "Use SkCodec internally in GIFImageDecoder"
> 4fed3346. This introduced building
> SkCodec.
> 
> "Enable Skia's SkImageGenerator implementation"
> f5eb27c2. This used SkCodec to fix
> crbug.com/758459, but that seems to have been fixed in another way.
> 
> In addition, this corrects some formatting in the old code (as
> commanded by presubmit), and makes some other minor changes (no more
> PassRefPtr, FrameDurationAtIndex now returns a TimeDelta).
> 
> Change-Id: Ic2bdd87740da0232c9c07e27eed6049efc26d76c
> Reviewed-on: https://chromium-review.googlesource.com/718918
> Commit-Queue: Leon Scroggins <scroggo@chromium.org>
> Reviewed-by: Chris Blume <cblume@chromium.org>
> Reviewed-by: Fredrik Söderquist <fs@opera.com>
> Reviewed-by: Leon Scroggins <scroggo@chromium.org>
> Reviewed-by: Philip Rogers <pdr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#509570}

TBR=scroggo@chromium.org,pdr@chromium.org,fs@opera.com,cblume@chromium.org

Change-Id: Ib4c5be2e885f483d881ca65689cb5e9f3dc755df
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 768878
Reviewed-on: https://chromium-review.googlesource.com/724359Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509577}