Removing redundant stub for runtime native calls.

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 2029 matching lines @@
 
   // Run function with two debugger statement
   foo->Call(env->Global(), 0, NULL);
   CHECK_EQ(3, break_point_hit_count);
 
   v8::Debug::SetDebugEventListener(NULL);
   CheckDebuggerUnloaded();
 }
 
 
+// Test setting a breakpoint on the  debugger statement.
+TEST(DebuggerStatementBreakpoint) {
+    break_point_hit_count = 0;
+    v8::HandleScope scope;
+    DebugLocalContext env;
+    v8::Debug::SetDebugEventListener(DebugEventBreakPointHitCount,
+                                     v8::Undefined());
+    v8::Script::Compile(v8::String::New("function foo(){debugger;}"))->Run();
+    v8::Local<v8::Function> foo =
+    v8::Local<v8::Function>::Cast(env->Global()->Get(v8::String::New("foo")));
+
+    // The debugger statement triggers breakpint hit
+    foo->Call(env->Global(), 0, NULL);
+    CHECK_EQ(1, break_point_hit_count);
+
+    int bp = SetBreakPoint(foo, 0);
+
+    // Set breakpoint does not duplicate hits
+    foo->Call(env->Global(), 0, NULL);
+    CHECK_EQ(2, break_point_hit_count);
+
+    ClearBreakPoint(bp);
+    v8::Debug::SetDebugEventListener(NULL);
+    CheckDebuggerUnloaded();
+}
+
+
 // Thest that the evaluation of expressions when a break point is hit generates
 // the correct results.
 TEST(DebugEvaluate) {
   v8::HandleScope scope;
   DebugLocalContext env;
   env.ExposeDebug();
 
   // Create a function for checking the evaluation when hitting a break point.
   evaluate_check_function = CompileFunction(&env,
                                             evaluate_check_source,
@@ skipping 4011 matching lines @@
 
   break_point_hit_count = 0;
   foo->Call(env->Global(), 0, NULL);
   CHECK_EQ(1, break_point_hit_count);
 
   v8::Debug::SetDebugEventListener(NULL);
   debugee_context = v8::Handle<v8::Context>();
   debugger_context = v8::Handle<v8::Context>();
   CheckDebuggerUnloaded();
 }