Provide an XMLHttpRequest constructor if used in JS modules

packagerGecko.py

Index: packagerGecko.py
===================================================================
--- a/packagerGecko.py
+++ b/packagerGecko.py
@@ -187,30 +187,33 @@ def fixupLocales(params, files):
       else:
         files[path] = reference[file]['_origData'].encode('utf-8')
 
 def addMissingFiles(params, files):
   templateData = {
     'hasChrome': False,
     'hasChromeRequires': False,
     'hasShutdownHandlers': False,
+    'hasXMLHttpRequest': False,
     'hasVersionPref': False,
     'chromeWindows': [],
     'requires': {},
     'metadata': params['metadata'],
     'multicompartment': params['multicompartment'],
     'applications': dict((v, k) for k, v in KNOWN_APPS.iteritems()),
   }
 
   def checkScript(name):
     content = files[name]
     for match in re.finditer(r'(?:^|\s)require\(\s*"([\w\-]+)"\s*\)', content):
       templateData['requires'][match.group(1)] = True
       if name.startswith('chrome/content/'):
         templateData['hasChromeRequires'] = True
+    if name.startswith('lib/') and re.search(r'\bXMLHttpRequest\b', content):
+      templateData['hasXMLHttpRequest'] = True
     if name == 'defaults/prefs.js':
       if re.search(r'\.currentVersion"', content):
         templateData['hasVersionPref'] = True
     if not '/' in name or name.startswith('lib/'):
       if re.search(r'(?:^|\s)onShutdown\.', content):
         templateData['hasShutdownHandlers'] = True
 
   for name, content in files.iteritems():