Bump clean-css from 3.4.28 to 4.1.11 in /chrome

[dependabot[bot]]

Bumps clean-css from 3.4.28 to 4.1.11.

Changelog

Sourced from clean-css's changelog.

4.1.11 / 2018-03-06

• Backports fixes to ReDOS vulnerabilities in validator code.

4.1.10 / 2018-03-05

• Fixed issue #988 - edge case in dropping default animation-duration.
• Fixed issue #989 - edge case in removing unused at rules.
• Fixed issue #1001 - corrupted tokenizer state.
• Fixed issue #1006 - edge case in handling invalid source maps.
• Fixed issue #1008 - edge case in breaking up font shorthand.

4.1.9 / 2017-09-19

• Fixed issue #971 - edge case in removing unused at rules.

4.1.8 / 2017-09-02

• Fixed issue #959 - regression in shortening long hex values.
• Fixed issue #960 - better explanation of efficiency stat.
• Fixed issue #965 - edge case in parsing comment endings.
• Fixed issue #966 - remote @imports referenced from local ones.

4.1.7 / 2017-07-14

• Fixed issue #957 - 0% minification of width property.

4.1.6 / 2017-07-08

• Fixed issue #887 - edge case in serializing comments.
• Fixed issue #953 - beautify breaks attribute selectors.

4.1.5 / 2017-06-29

• Fixed issue #945 - hex RGBA colors in IE filters.
• Fixed issue #952 - parsing @page according to CSS3 spec.

4.1.4 / 2017-06-14

• Fixed issue #950 - bug in removing unused @font-face rules.

4.1.3 / 2017-05-18

... (truncated)

Commits

• 7812d59 Version 4.1.11.
• 0440b4a Fixes ReDOS vulnerabilities.
• c601ebd Version 4.1.10.
• 9e0a38e Fixes #1006 - handling invalid input source maps.
• 913d72c Fixes #1008 - edge case in breaking up font.
• bedd8a9 Adds @abarre fix to #1001 to release notes.
• e944a2b #1001 Fix corrupted state of tokenizer (#1010)
• 8be4084 Fixes #989 - edge case in removing unused at-rules.
• 21a5df0 Fixes #988 - edge case in dropping animation-duration.
• 5f6cbc6 Version 4.1.9.
• Additional commits viewable in compare view

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