We need to change ImmutableArray to be backed by a Vector, so that we can add a MutableArray subclass.
Created attachment 66284 [details]
Attachment 66284 [details] did not pass style-queue:
Failed to run "['WebKitTools/Scripts/check-webkit-style']" exit_code: 1
WebKit2/WebProcess/InjectedBundle/InjectedBundle.cpp:130: More than one command on the same line [whitespace/newline] 
WebKit2/Shared/ImmutableArray.h:58: More than one command on the same line in if [whitespace/parens] 
Total errors found: 2 in 8 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Fixed in http://trac.webkit.org/changeset/66621.