Delete obviously unneeded forward declarations in chrome/browser/*.h.

chrome/browser/task_manager.h

Index: chrome/browser/task_manager.h
diff --git a/chrome/browser/task_manager.h b/chrome/browser/task_manager.h
index 2865a467d43c3e31ef438dc331996fffd541e3f3..9326813c391e39020272cf784321a91b5728b680 100644
--- a/chrome/browser/task_manager.h
+++ b/chrome/browser/task_manager.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -26,11 +26,8 @@
 class Extension;
 class SkBitmap;
 class TabContents;
-class TaskManager;
 class TaskManagerModel;
 
-struct BytesReadParam;
-
 namespace base {
 class ProcessMetrics;
 }