Reduce header dependencies in base/

base/debug_util.h

 // Copyright (c) 2006-2009 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.
 
 // This is a cross platform interface for helper functions related to debuggers.
 // You should use this to test if you're running under a debugger, and if you
 // would like to yield (breakpoint) into the debugger.
 
 #ifndef BASE_DEBUG_UTIL_H_
 #define BASE_DEBUG_UTIL_H_
 
-#include <iostream>
+#include <iosfwd>
 #include <vector>
 
 #include "base/basictypes.h"
 
 // A stacktrace can be helpful in debugging. For example, you can include a
 // stacktrace member in a object (probably around #ifndef NDEBUG) so that you
 // can later see where the given object was created from.
 class StackTrace {
  public:
   // Create a stacktrace from the current location
@@ skipping 38 matching lines @@
   // process a Chrome crash.  This translates into a long wait till the process
   // actually dies.
   // This method disables OS Crash reporting entireley.
   // TODO(playmobil): Remove this when we have Breakpad integration enabled -
   // see http://crbug.com/7652
   static void DisableOSCrashDumps();
 #endif  // defined(OS_MACOSX)
 };
 
 #endif  // BASE_DEBUG_UTIL_H_