Small MessageLocation related refactoring.

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <queue>
 #include <set>
 
@@ skipping 754 matching lines @@
   void CancelScheduledExceptionFromTryCatch(v8::TryCatch* handler);
   void ReportPendingMessages();
   // Return pending location if any or unfilled structure.
   MessageLocation GetMessageLocation();
 
   // Promote a scheduled exception to pending. Asserts has_scheduled_exception.
   Object* PromoteScheduledException();
 
   // Attempts to compute the current source location, storing the
   // result in the target out parameter.
-  void ComputeLocation(MessageLocation* target);
+  bool ComputeLocation(MessageLocation* target);
   bool ComputeLocationFromException(MessageLocation* target,
                                     Handle<Object> exception);
   bool ComputeLocationFromStackTrace(MessageLocation* target,
                                      Handle<Object> exception);
 
   Handle<JSMessageObject> CreateMessage(Handle<Object> exception,
                                         MessageLocation* location);
 
   // Out of resource exception helpers.
   Object* StackOverflow();
@@ skipping 801 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_