Revert change 23636 as it is causing issues on dartium. Will resubmit after investigating the darti…

runtime/vm/code_observers.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/code_observers.h"
 
-#include "platform/utils.h"
 #include "vm/os.h"
 
 namespace dart {
 
 intptr_t CodeObservers::observers_length_ = 0;
 CodeObserver** CodeObservers::observers_ = NULL;
 
 
 void CodeObservers::Register(CodeObserver* observer) {
-  intptr_t new_length = observers_length_ + 1;
-  observers_ = Utils::Realloc(observers_, observers_length_, new_length);
+  observers_length_++;
+  observers_ = reinterpret_cast<CodeObserver**>(
+      realloc(observers_, sizeof(observer) * observers_length_));
   if (observers_ == NULL) {
     FATAL("failed to grow code observers array");
   }
-  observers_length_ = new_length;
   observers_[observers_length_ - 1] = observer;
 }
 
 
 void CodeObservers::NotifyAll(const char* name,
                               uword base,
                               uword prologue_offset,
                               uword size,
                               bool optimized) {
   ASSERT(!AreActive() || (strlen(name) != 0));
@@ skipping 20 matching lines @@
   free(observers_);
 }
 
 
 void CodeObservers::InitOnce() {
   OS::RegisterCodeObservers();
 }
 
 
 }  // namespace dart