Revert 111080 - Remove Task inheritance in clipboard code.

content/browser/renderer_host/clipboard_message_filter_mac.mm

Index: content/browser/renderer_host/clipboard_message_filter_mac.mm
===================================================================
--- content/browser/renderer_host/clipboard_message_filter_mac.mm	(revision 111082)
+++ content/browser/renderer_host/clipboard_message_filter_mac.mm	(working copy)
@@ -6,25 +6,20 @@
 
 #import <Cocoa/Cocoa.h>
 
-#include "base/basictypes.h"
-#include "base/bind.h"
-#include "base/bind_helpers.h"
 #include "base/sys_string_conversions.h"
 #import "content/browser/find_pasteboard.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 
-namespace {
-
 // The number of utf16 code units that will be written to the find pasteboard,
 // longer texts are silently ignored. This is to prevent that a compromised
 // renderer can write unlimited amounts of data into the find pasteboard.
 static const size_t kMaxFindPboardStringLength = 4096;
 
-class WriteFindPboardWrapper {
+class WriteFindPboardTask : public Task {
  public:
-  explicit WriteFindPboardWrapper(NSString* text)
+  explicit WriteFindPboardTask(NSString* text)
       : text_([text retain]) {}
 
   void Run() {
@@ -33,12 +28,8 @@
 
  private:
   scoped_nsobject<NSString> text_;
-
-  DISALLOW_COPY_AND_ASSIGN(WriteFindPboardWrapper);
 };
 
-}  // namespace
-
 // Called on the IO thread.
 void ClipboardMessageFilter::OnFindPboardWriteString(const string16& text) {
   if (text.length() <= kMaxFindPboardStringLength) {
@@ -46,9 +37,7 @@
     if (nsText) {
       // FindPasteboard must be used on the UI thread.
       BrowserThread::PostTask(
-          BrowserThread::UI, FROM_HERE, base::Bind(
-              &WriteFindPboardWrapper::Run,
-              base::Owned(new WriteFindPboardWrapper(nsText))));
+          BrowserThread::UI, FROM_HERE, new WriteFindPboardTask(nsText));
     }
   }
 }