Merge the classes Debug and Debugger.

src/execution.h

 // Copyright 2014 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_EXECUTION_H_
 #define V8_EXECUTION_H_
 
 #include "handles.h"
 
 namespace v8 {
@@ skipping 86 matching lines @@
       Handle<FunctionTemplateInfo> data);
   MUST_USE_RESULT static MaybeHandle<JSObject> InstantiateObject(
       Handle<ObjectTemplateInfo> data);
   MUST_USE_RESULT static MaybeHandle<Object> ConfigureInstance(
       Isolate* isolate,  Handle<Object> instance, Handle<Object> data);
   static Handle<String> GetStackTraceLine(Handle<Object> recv,
                                           Handle<JSFunction> fun,
                                           Handle<Object> pos,
                                           Handle<Object> is_global);
 
-  static void DebugBreakHelper(Isolate* isolate);
-  static void ProcessDebugMessages(Isolate* isolate, bool debug_command_only);
-
   // Get a function delegate (or undefined) for the given non-function
   // object. Used for support calling objects as functions.
   static Handle<Object> GetFunctionDelegate(Isolate* isolate,
                                             Handle<Object> object);
   MUST_USE_RESULT static MaybeHandle<Object> TryGetFunctionDelegate(
       Isolate* isolate,
       Handle<Object> object);
 
   // Get a function delegate (or undefined) for the given non-function
   // object. Used for support calling objects as constructors.
@@ skipping 158 matching lines @@
   friend class Isolate;
   friend class StackLimitCheck;
   friend class PostponeInterruptsScope;
 
   DISALLOW_COPY_AND_ASSIGN(StackGuard);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXECUTION_H_