This reverts commit 8d388ccf.

Reason for revert:
Sorry to revert such a large CL, but I believe it to be the culprit of
many calendar-picker flaky failures on Mac10.11:
https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Mac10.11?numbuilds=200

Initial failures:
https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Mac10.11/builds/23036

Unexpected Failures:
* fast/forms/calendar-picker/calendar-picker-appearance-zoom125.html
* fast/forms/calendar-picker/calendar-picker-datetimelocal.html
* fast/forms/calendar-picker/calendar-picker-key-operations.html
* fast/forms/calendar-picker/calendar-picker-pre-100-year.html
* fast/forms/calendar-picker/calendar-picker-should-not-change-datetimelocal-time.html
* fast/forms/calendar-picker/date-picker-choose-default-value-after-set-value.html
* fast/forms/calendar-picker/datetimelocal-picker-choose-default-value-after-set-value.html
* fast/forms/calendar-picker/week-picker-choose-default-value-after-set-value.html
* fast/forms/calendar-picker/week-picker-mouse-operations.html
* fast/forms/color/color-suggestion-picker-appearance-zoom200.html
* fast/forms/suggestion-picker/date-suggestion-picker-appearance-with-scroll-bar.html
* fast/forms/suggestion-picker/date-suggestion-picker-appearance.html
* fast/forms/suggestion-picker/date-suggestion-picker-key-operations.html
* fast/forms/suggestion-picker/datetimelocal-suggestion-picker-appearance-with-scroll-bar.html
* fast/forms/suggestion-picker/datetimelocal-suggestion-picker-appearance.html
* fast/forms/suggestion-picker/datetimelocal-suggestion-picker-key-operations.html
* fast/forms/suggestion-picker/month-suggestion-picker-appearance-with-scroll-bar.html
* fast/forms/suggestion-picker/month-suggestion-picker-key-operations.html
* fast/forms/suggestion-picker/time-suggestion-picker-appearance-locale-hebrew.html
* fast/forms/suggestion-picker/time-suggestion-picker-key-operations.html
* fast/forms/suggestion-picker/week-suggestion-picker-appearance-with-scroll-bar.html
* fast/forms/suggestion-picker/week-suggestion-picker-appearance.html
* fast/forms/suggestion-picker/week-suggestion-picker-key-operations.html

Original change's description:
> Enable Skia's new linear gradient impl for 8888
> 
> (remove SK_SUPPORT_LEGACY_LINEAR_GRADIENT)
> 
> The new implementation is generally more correct/accurate, slightly
> faster in some cases and slightly slower in others.
> 
> TBR=
> 
> Change-Id: If1fd4115b40602491b8535e4a9a1cce7855d4209
> Reviewed-on: https://chromium-review.googlesource.com/642368


> Commit-Queue: Florin Malita <fmalita@chromium.org>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#498619}

TBR=fmalita@chromium.org,reed@chromium.org,mtklein@chromium.org

Change-Id: Ic4d9ae1a43a2e62dc48a8d69f72701e8c7d62e94
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/646086


Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#498851}