DevTools: fix color swatch copy icon color
DevTools: fix color swatch copy icon color

Screenshot: https://imgur.com/a/bOoDTny

Bug: 959001
Change-Id: Idc6e7303821e4180ec90831341a29aebe594fcc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1597283
Reviewed-by: Joel Einbinder <bab755abe9fee48fe544272e55f73517d4e4a725@chromium.org>
Commit-Queue: Erik Luo <26192f5e05d23e5ee959014fb911d780e566545b@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#659295}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 949d5499eabc8a0b35b99256895abc197ddabf37

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend