Revert workaround for http://crbug.com/9746.

test/cctest/test-debug.cc

 // Copyright 2007-2008 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 4638 matching lines @@
 
   // Set and check different data values.
   v8::Handle<v8::Value> data_1 = v8::Number::New(1);
   v8::Handle<v8::Value> data_2 = v8::String::New("2");
   context_1->SetData(data_1);
   context_2->SetData(data_2);
   CHECK(context_1->GetData()->StrictEquals(data_1));
   CHECK(context_2->GetData()->StrictEquals(data_2));
 
   // Simple test function which causes a break.
-  char* source = "function f() { debugger; }";
+  const char* source = "function f() { debugger; }";
 
   // Enter and run function in the first context.
   {
     v8::Context::Scope context_scope(context_1);
     expected_context = context_1;
     expected_context_data = data_1;
     v8::Local<v8::Function> f = CompileFunction(source, "f");
     f->Call(context_1->Global(), 0, NULL);
   }
 
 
   // Enter and run function in the second context.
   {
     v8::Context::Scope context_scope(context_2);
     expected_context = context_2;
     expected_context_data = data_2;
     v8::Local<v8::Function> f = CompileFunction(source, "f");
     f->Call(context_2->Global(), 0, NULL);
   }
 
   // Two times compile event and two times break event.
   CHECK_GT(message_handler_hit_count, 4);
 }