[debugger] do not predict step in target for liveedit.

src/builtins.h

 // Copyright 2011 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_BUILTINS_H_
 #define V8_BUILTINS_H_
 
 #include "src/base/flags.h"
 #include "src/handles.h"
 
@@ skipping 183 matching lines @@
   V(StoreIC_Slow,            STORE_IC)       \
   V(KeyedStoreIC_Slow,       KEYED_STORE_IC) \
   V(LoadIC_Normal,           LOAD_IC)        \
   V(LoadIC_Normal_Strong,    LOAD_IC)        \
   V(StoreIC_Normal,          STORE_IC)
 
 // Define list of builtins used by the debugger implemented in assembly.
 #define BUILTIN_LIST_DEBUG_A(V)                                 \
   V(Return_DebugBreak, BUILTIN, DEBUG_STUB, kNoExtraICState)    \
   V(Slot_DebugBreak, BUILTIN, DEBUG_STUB, kNoExtraICState)      \
-  V(PlainReturn_LiveEdit, BUILTIN, DEBUG_STUB, kNoExtraICState) \
   V(FrameDropper_LiveEdit, BUILTIN, DEBUG_STUB, kNoExtraICState)
 
 
 class BuiltinFunctionTable;
 class ObjectVisitor;
 
 
 class Builtins {
  public:
   ~Builtins();
@@ skipping 176 matching lines @@
   friend class BuiltinFunctionTable;
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_H_