chrome/browser should build on the x86_64 architecture

third_party/mozilla/README.chromium

 Name: Cocoa extension code from Camino
 Short Name: camino
 URL: http://caminobrowser.org/
 Version: unknown
 License: MPL 1.1/GPL 2.0/LGPL 2.1
 
 Description:
   This directory contains the following files come from (Mozilla) Camino
   (src/camino/src/extensions):
 
     NSPasteboard+Utils.h/mm
     NSScreen+Utils.h/m
     NSString+Utils.h/m
     NSURL+Utils.h/m
     NSWorkspace+Utils.h/m
 
 Local modifications:
 - NSURL+Utils.m was modified to use non-deprecated Cocoa APIs to allow
   compilation on future versions of Mac OS X.
 - NSString+Utils.m was renamed to NSString+Utils.mm and modified to use GURL
   for validation in -[NSString isValidURI].
 - NSPasteboard+Utils.mm was modified to add an argument to
   -[NSPasteboard getURLs:andTitles:] to determine whether or not filenames in
   the drag should be converted to file URLs.
   -[NSPasteboard htmlFromRtf] added to do rtf->html conversion.
+- NSWorkspace+Utils.m was modified to compile on the x86_64 architecture.
 
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 Also includes IME panel from Gecko, which is based on WebKit's implementation.
 Although it comes from Mozilla (http://mxr.mozilla.org), it uses the original
 WebKit license.
 
 Local modifitations:
 - Add #ifdef'd definifitions of a few symbols to support 10.5 SDK.