Avoid bool to Oddball conversions by being lazy.

src/execution.h

 // Copyright 2011 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 73 matching lines @@
   // Call a function, just like Call(), but make sure to silently catch
   // any thrown exceptions. The return value is either the result of
   // calling the function (if caught exception is false) or the exception
   // that occurred (if caught exception is true).
   static Handle<Object> TryCall(Handle<JSFunction> func,
                                 Handle<Object> receiver,
                                 int argc,
                                 Handle<Object> argv[],
                                 bool* caught_exception);
 
-  // ECMA-262 9.2
-  static Handle<Object> ToBoolean(Isolate* isolate, Handle<Object> obj);
-
   // ECMA-262 9.3
   static Handle<Object> ToNumber(Handle<Object> obj, bool* exc);
 
   // ECMA-262 9.4
   static Handle<Object> ToInteger(Handle<Object> obj, bool* exc);
 
   // ECMA-262 9.5
   static Handle<Object> ToInt32(Handle<Object> obj, bool* exc);
 
   // ECMA-262 9.6
@@ skipping 194 matching lines @@
   friend class StackLimitCheck;
   friend class PostponeInterruptsScope;
 
   DISALLOW_COPY_AND_ASSIGN(StackGuard);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXECUTION_H_