Add basic piping for BackForwardControllerClient.
Created attachment 60738 [details]
Attachment 60738 [details] did not pass style-queue:
Failed to run "['WebKitTools/Scripts/check-webkit-style', '--no-squash']" exit_code: 1
WebKit2/WebProcess/WebCoreSupport/WebBackForwardControllerClient.cpp:26: Found header this file implements before WebCore config.h. Should be: config.h, primary header, blank line, and then alphabetically sorted. [build/include_order] 
WARNING: File exempt from style guide. Skipping: "WebKit/qt/Api/qwebpage.cpp"
Total errors found: 1 in 24 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Landed in http://trac.webkit.org/changeset/62676.