Make HashMap a template class to specify the allocation policy.

src/cpu-profiler.h

Index: src/cpu-profiler.h
===================================================================
--- src/cpu-profiler.h	(revision 10795)
+++ src/cpu-profiler.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2012 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:
@@ -41,7 +41,6 @@
 class CodeMap;
 class CpuProfile;
 class CpuProfilesCollection;
-class HashMap;
 class ProfileGenerator;
 class TokenEnumerator;