Improve user agent stylesheet minification

Source/core/css/make-css-file-arrays.pl

Index: Source/core/css/make-css-file-arrays.pl
diff --git a/Source/core/css/make-css-file-arrays.pl b/Source/core/css/make-css-file-arrays.pl
index 66eb7dfb0e4cd9f8215eff72a47ac4618f8704b7..811d7f958fcca6d7ca7c821d6fc95d0cdf7d265d 100755
--- a/Source/core/css/make-css-file-arrays.pl
+++ b/Source/core/css/make-css-file-arrays.pl
@@ -65,10 +65,13 @@ for my $in (@ARGV) {
 
     # Crunch whitespace just to make it a little smaller.
     # Could do work to avoid doing this inside quote marks but our files don't have runs of spaces in quotes.
-    # Could crunch further based on places where whitespace is optional.
-    $text =~ s|\s+| |gs;
-    $text =~ s|^ ||;
-    $text =~ s| $||;
+    # FIXME: Use a proper css minifier to crunch this further.
+    $text =~ s|^[\s]+||gm; # remove optional leading spaces.
+    $text =~ s|[\s]*:[\s]*|:|gm; # remove optional spaces around colons.
+    $text =~ s|[\s]*{[\s]*|{|gm; # remove optional spaces around open braces.
+    $text =~ s|[\s;]*}[\s]*|}|gm; # remove optional spaces around end braces and semicolons before end braces.
+    $text =~ s|[\s]*,[\s]*|,|gm; # remove optional spaces around commas.
+    $text =~ s|\R||g; # remove newlines.
 
     # Write out a C array of the characters.
     my $length = length $text;