Revert "Update PWA frame color to match HTML theme-color meta tag"

This reverts commit ea67b57d05efdf10e6aadae6776cc0f428d0991a.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 639842 as the
culprit for flakes in the build cycles as shown on:
https://analysis.chromium.org/p/chromium/flake-portal/analysis/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vZWE2N2I1N2QwNWVmZGYxMGU2YWFkYWU2Nzc2Y2MwZjQyOGQwOTkxYQw

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.mac/Mac10.13%20Tests%20%28dbg%29/9916

Sample Failed Step: browser_tests on (none) GPU on Mac

Sample Flaky Test: BrowserNonClientFrameViewBrowserTest.HTMLMetaThemeColorOverridesManifest

Original change's description:
> Update PWA frame color to match HTML theme-color meta tag
> 
> This CL updates PWA windows to use the HTML theme-color meta tag
> as the frame color over the manifest's theme_color.
> 
> This is in line with the Web App Manifest spec text:
> https://www.w3.org/TR/appmanifest/#theme_color-member
> 
> Before: https://bugs.chromium.org/p/chromium/issues/attachment?aid=382160&signed_aid=n5SryIX1Gm4-apNPrIOfzA==&inline=1
> After: https://bugs.chromium.org/p/chromium/issues/attachment?aid=382161&signed_aid=o5hmc8fm-i1d6FXwuam15A==&inline=1
> 
> Bug: 872121
> Change-Id: Ib431f7b7612c5167cde2489f0263240747d8d50d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1496267
> Commit-Queue: Alan Cutter <alancutter@chromium.org>
> Reviewed-by: Camille Lamy <clamy@chromium.org>
> Reviewed-by: Peter Kasting <pkasting@chromium.org>
> Auto-Submit: Alan Cutter <alancutter@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#639842}

Change-Id: I534ff44a84967d528ecd5b8b6f24622d9fb51ea7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 872121
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1517793
Cr-Commit-Position: refs/heads/master@{#639878}
14 files changed