Reduce the amount of included header files. Vast change like in "Oh God! This...

net/base/io_buffer.h

 // Copyright (c) 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.
 
 #ifndef NET_BASE_IO_BUFFER_H_
 #define NET_BASE_IO_BUFFER_H_
 
-#include "base/logging.h"
 #include "base/ref_counted.h"
 
 namespace net {
 
 // This is a simple wrapper around a buffer that provides ref counting for
 // easier asynchronous IO handling.
 class IOBuffer : public base::RefCountedThreadSafe<IOBuffer> {
  public:
   IOBuffer() : data_(NULL) {}
-  explicit IOBuffer(int buffer_size) {
-    DCHECK(buffer_size);
-    data_ = new char[buffer_size];
-  }
+  explicit IOBuffer(int buffer_size);
   explicit IOBuffer(char* data) : data_(data) {}
   virtual ~IOBuffer() {
     delete[] data_;
   }
 
   char* data() { return data_; }
 
  protected:
   char* data_;
 };
 
 // This class allows the creation of a temporary IOBuffer that doesn't really
 // own the underlying buffer. Please use this class only as a last resort.
 // A good example is the buffer for a synchronous operation, where we can be
 // sure that nobody is keeping an extra reference to this object so the lifetime
 // of the buffer can be completely managed by its intended owner.
 class WrappedIOBuffer : public net::IOBuffer {
  public:
   explicit WrappedIOBuffer(const char* data)
       : net::IOBuffer(const_cast<char*>(data)) {}
   ~WrappedIOBuffer() {
     data_ = NULL;
   }
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_IO_BUFFER_H_