extensions: darken some disabled text for better contrast.

extensions: darken some disabled text for better contrast.

This is the Accessibility Developer Tools suggested color
for a 4.5 contrast ratio (minimum for AA rating[1] /
audit to stop barking).

R=kalman@chromium.org
BUG=439227
[1] http://www.w3.org/WAI/WCAG2AA-Conformance

Committed: https://crrev.com/7a5f18904bdb7948a877e96fb4b9f5a5e481447a
Cr-Commit-Position: refs/heads/master@{#314022}

[Dan Beam, 2015-01-30 22:07:03]

https://codereview.chromium.org/893603006/diff/1/chrome/browser/ui/webui/exte...
File chrome/browser/ui/webui/extensions/extension_settings_browsertest.js
(left):

https://codereview.chromium.org/893603006/diff/1/chrome/browser/ui/webui/exte...
chrome/browser/ui/webui/extensions/extension_settings_browsertest.js:36:
this.accessibilityAuditConfig.ignoreSelectors(
I also deleted this line[1] to make sure the tests pass if "lowContrastElements"
is re-enabled in the future.

[1]
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/test/data/w...

[not at google - send to devlin, 2015-01-30 22:32:32]

lgtm

[Dan Beam, 2015-01-30 22:34:10]

The CQ bit was checked by dbeam@chromium.org

[commit-bot: I haz the power, 2015-01-30 22:34:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/893603006/1

[commit-bot: I haz the power, 2015-01-30 23:17:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-30 23:18:50]

Patchset 1 (id:??) landed as
https://crrev.com/7a5f18904bdb7948a877e96fb4b9f5a5e481447a
Cr-Commit-Position: refs/heads/master@{#314022}