DevTools: Properly prepend cm- to all classes that CodeMirror returns
DevTools: Properly prepend cm- to all classes that CodeMirror returns

Sometimes codemirror returns classes like "class1 class2", but only
the first one would be prepended with "cm-".

Bug: 955550
Change-Id: I6733c67e3a9074bc3566d356320b67f0e011c7ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1690743
Commit-Queue: Joel Einbinder <bab755abe9fee48fe544272e55f73517d4e4a725@chromium.org>
Reviewed-by: Erik Luo <26192f5e05d23e5ee959014fb911d780e566545b@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#675927}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: ebf5684d88b3d0724ef15a09027b103280cea807

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