Move MatchRequest out of StyleResolver.h

Move the MatchRequest class out of StyleResolver.h and into a separate
file.

R=eseidel@chromium.org
BUG=237268

Review URL: https://chromiumcodereview.appspot.com/20357003

git-svn-id: svn://svn.chromium.org/blink/trunk@154957 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Improving initialization of the CJK Symbols HashSet.

R=abarth,eseidel
BUG=251328

Review URL: https://chromiumcodereview.appspot.com/20371003

git-svn-id: svn://svn.chromium.org/blink/trunk@154958 bbb929c8-8fbe-4397-9dbb-9b2b20218538