Bug 841404. Make sure that we treat dictionaries inside sequence and array members of a dictionary as dependencies for it. r=peterv

dom/bindings/Codegen.py

@@ -6812,14 +6812,21 @@ class CGDictionary(CGThing):
     def makeIdName(name):
         return name + "_id"
 
+    @staticmethod
+    def getDictionaryDependenciesFromType(type):
+        if type.isDictionary():
+            return set([type.unroll().inner])
+        if type.isSequence() or type.isArray():
+            return CGDictionary.getDictionaryDependenciesFromType(type.unroll())
+        return set()
+
     @staticmethod
     def getDictionaryDependencies(dictionary):
         deps = set();
         if dictionary.parent:
             deps.add(dictionary.parent)
         for member in dictionary.members:
-            if member.type.isDictionary():
-                deps.add(member.type.unroll().inner)
+            deps |= CGDictionary.getDictionaryDependenciesFromType(member.type)
         return deps