Remove unused CodeRegion class and corresponding logging functions.

src/log.h

 // Copyright 2006-2008 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 156 matching lines @@
   static void CodeCreateEvent(const char* tag, Code* code, String* name,
                               String* source, int line);
   static void CodeCreateEvent(const char* tag, Code* code, int args_count);
   // Emits a code create event for a RegExp.
   static void RegExpCodeCreateEvent(Code* code, String* source);
   static void CodeAllocateEvent(Code* code, Assembler* assem);
   // Emits a code move event.
   static void CodeMoveEvent(Address from, Address to);
   // Emits a code delete event.
   static void CodeDeleteEvent(Address from);
-  // Emits region delimiters
-  static void BeginCodeRegionEvent(CodeRegion* region,
-                                   Assembler* masm,
-                                   const char* name);
-  static void EndCodeRegionEvent(CodeRegion* region, Assembler* masm);
 
   // ==== Events logged by --log-gc. ====
   // Heap sampling events: start, end, and individual types.
   static void HeapSampleBeginEvent(const char* space, const char* kind);
   static void HeapSampleEndEvent(const char* space, const char* kind);
   static void HeapSampleItemEvent(const char* type, int number, int bytes);
 
   static void SharedLibraryEvent(const char* library_path,
                                  unsigned start,
                                  unsigned end);
@@ skipping 91 matching lines @@
   void Trace(TickSample* sample);
  private:
 
   unsigned int low_stack_bound_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOG_H_