Refactor BreakLocationIterator.

test/cctest/test-func-name-inference.cc

 // 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 63 matching lines @@
     i::DisallowHeapAllocation no_gc;
     Vector<const uint8_t> func_pos_str = i::OneByteVector(func_pos_src);
     String::FlatContent script_content = script_src->GetFlatContent();
     func_pos = SearchString(isolate, script_content.ToOneByteVector(),
                             func_pos_str, 0);
   }
   CHECK_NE(0, func_pos);
 
   // Obtain SharedFunctionInfo for the function.
   isolate->debug()->PrepareForBreakPoints();
-  Object* shared_func_info_ptr =
-      isolate->debug()->FindSharedFunctionInfoInScript(i_script, func_pos);
-  CHECK(shared_func_info_ptr != CcTest::heap()->undefined_value());
-  Handle<SharedFunctionInfo> shared_func_info(
-      SharedFunctionInfo::cast(shared_func_info_ptr));
+  Handle<SharedFunctionInfo> shared_func_info =
+      Handle<SharedFunctionInfo>::cast(
+          isolate->debug()->FindSharedFunctionInfoInScript(i_script, func_pos));
 
   // Verify inferred function name.
   SmartArrayPointer<char> inferred_name =
       shared_func_info->inferred_name()->ToCString();
   CHECK_EQ(0, strcmp(ref_inferred_name, inferred_name.get()));
 }
 
 
 static v8::Handle<v8::Script> Compile(v8::Isolate* isolate, const char* src) {
   return v8::Script::Compile(v8::String::NewFromUtf8(isolate, src));
@@ skipping 400 matching lines @@
       "  };\n"
       "  var foo = 10;\n"
       "  function f() {\n"
       "    return wrapCode();\n"
       "  }\n"
       "  this.ref = f;\n"
       "})()");
   script->Run();
   CheckFunctionName(script, "return 2012", "");
 }