Revert "Switch profiler from isolates to threads"

runtime/bin/dartutils.h

 // 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.
 
 #ifndef BIN_DARTUTILS_H_
 #define BIN_DARTUTILS_H_
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 
@@ skipping 563 matching lines @@
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CObjectExternalUint8Array);
 };
 
 
 class ScopedBlockingCall {
  public:
   ScopedBlockingCall() {
-    Dart_ThreadDisableProfiling();
+    Dart_IsolateBlocked();
   }
 
   ~ScopedBlockingCall() {
-    Dart_ThreadEnableProfiling();
+    Dart_IsolateUnblocked();
   }
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_DARTUTILS_H_