Remove strong mode support from property loads.

src/crankshaft/hydrogen.h

Index: src/crankshaft/hydrogen.h
diff --git a/src/crankshaft/hydrogen.h b/src/crankshaft/hydrogen.h
index 02e46c714026f4e42a0994b9e70d5702951fd0e2..fb7aff36a0da6f1e5bfa427dd9f18b3d1bcd8921 100644
--- a/src/crankshaft/hydrogen.h
+++ b/src/crankshaft/hydrogen.h
@@ -1347,8 +1347,7 @@ class HGraphBuilder {
 
   HValue* BuildUncheckedDictionaryElementLoad(HValue* receiver,
                                               HValue* elements, HValue* key,
-                                              HValue* hash,
-                                              LanguageMode language_mode);
+                                              HValue* hash);
 
   // ES6 section 7.4.7 CreateIterResultObject ( value, done )
   HValue* BuildCreateIterResultObject(HValue* value, HValue* done);