Make the strict-mode calling convention for contextual calls the default one.

src/v8globals.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 271 matching lines @@
 enum CheckType {
   RECEIVER_MAP_CHECK,
   STRING_CHECK,
   SYMBOL_CHECK,
   NUMBER_CHECK,
   BOOLEAN_CHECK
 };
 
 
 enum CallFunctionFlags {
-  NO_CALL_FUNCTION_FLAGS = 0,
-  // Receiver might implicitly be the global objects. If it is, the
-  // hole is passed to the call function stub.
-  RECEIVER_MIGHT_BE_IMPLICIT = 1 << 0,
-  // Receiver is implicit and the hole has been passed to the stub.
-  RECEIVER_IS_IMPLICIT = 1 << 1,
+  NO_CALL_FUNCTION_FLAGS,
   // The call target is cached in the instruction stream.
-  RECORD_CALL_TARGET = 1 << 2
+  RECORD_CALL_TARGET
 };
 
 
 enum InlineCacheHolderFlag {
   OWN_MAP,  // For fast properties objects.
   PROTOTYPE_MAP  // For slow properties objects (except GlobalObjects).
 };
 
 
 // The Store Buffer (GC).
@@ skipping 266 matching lines @@
 
 
 enum MinusZeroMode {
   TREAT_MINUS_ZERO_AS_ZERO,
   FAIL_ON_MINUS_ZERO
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_