[debugger] remove obsolete counter for v8::Debug::GetMirror.

src/counters.h

 // Copyright 2012 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_COUNTERS_H_
 #define V8_COUNTERS_H_
 
 #include "include/v8.h"
 #include "src/allocation.h"
 #include "src/base/atomic-utils.h"
@@ skipping 528 matching lines @@
   V(Array_New)                                             \
   V(BooleanObject_BooleanValue)                            \
   V(BooleanObject_New)                                     \
   V(Context_New)                                           \
   V(Context_NewRemoteContext)                              \
   V(DataView_New)                                          \
   V(Date_DateTimeConfigurationChangeNotification)          \
   V(Date_New)                                              \
   V(Date_NumberValue)                                      \
   V(Debug_Call)                                            \
-  V(Debug_GetMirror)                                       \
   V(Error_New)                                             \
   V(External_New)                                          \
   V(Float32Array_New)                                      \
   V(Float64Array_New)                                      \
   V(Function_Call)                                         \
   V(Function_New)                                          \
   V(Function_NewInstance)                                  \
   V(FunctionTemplate_GetFunction)                          \
   V(FunctionTemplate_New)                                  \
   V(FunctionTemplate_NewRemoteInstance)                    \
@@ skipping 773 matching lines @@
 
   explicit Counters(Isolate* isolate);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Counters);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COUNTERS_H_