Revert of Updated the omnibox on Android to color URLs correctly (patchset #2 id...

Revert of Updated the omnibox on Android to color URLs correctly (patchset #2 id:20001 of https://codereview.chromium.org/771903003/)

Reason for revert:
(silently) broke org.chromium.chrome.browser.omnibox.OmniboxUrlEmphasizerTest#testShortSecureHTTPSUrlWithLightColors

Original issue's description:
> Updated the omnibox on Android to color URLs correctly
>
> Updated the URL coloring logic on Android to color the light-grey
> portions of URLs (currently #969696 100% opacity) to #333333 50% opacity
> on light backgrounds and #ffffff 50% opacity on dark backgrounds. Also
> updated the URL coloring tests to reflect this.
>
> Based on crrev.com/751423003.
>
> BUG=430771
>
> Committed: https://crrev.com/0ecb56c7474db0b57c50102adc0ee3815a0182f3
> Cr-Commit-Position: refs/heads/master@{#306558}

TBR=tedchoc@chromium.org,sashab@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=430771

Review URL: https://codereview.chromium.org/749283006

Cr-Commit-Position: refs/heads/master@{#306647}