[debugger] Remove obsolete stepping modes.

src/debug/debug.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_DEBUG_DEBUG_H_
 #define V8_DEBUG_DEBUG_H_
 
 #include "src/allocation.h"
 #include "src/arguments.h"
 #include "src/assembler.h"
@@ skipping 19 matching lines @@
 class DebugScope;
 
 
 // Step actions. NOTE: These values are in macros.py as well.
 enum StepAction {
   StepNone = -1,  // Stepping not prepared.
   StepOut = 0,    // Step out of the current function.
   StepNext = 1,   // Step to the next statement in the current function.
   StepIn = 2,     // Step into new functions invoked or the next statement
                   // in the current function.
-  StepMin = 3,    // Perform a minimum step in the current function.
-  StepInMin = 4,  // Step into new functions invoked or perform a minimum step
-                  // in the current function.
-  StepFrame = 5   // Step into a new frame or return to previous frame.
+  StepFrame = 3   // Step into a new frame or return to previous frame.
 };
 
 
 // Type of exception break. NOTE: These values are in macros.py as well.
 enum ExceptionBreakType {
   BreakException = 0,
   BreakUncaughtException = 1
 };
 
 
@@ skipping 707 matching lines @@
 
   static void PatchDebugBreakSlot(Address pc, Handle<Code> code);
   static void ClearDebugBreakSlot(Address pc);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_H_