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
diff --git a/content/browser/renderer_host/clipboard_message_filter_mac.mm b/content/browser/renderer_host/clipboard_message_filter_mac.mm
index 81faeb10c5a65ce293eff11cb73c7cf0682107fb..168eb55f352d55e853a26a924cb577e988b575ce 100644
--- a/content/browser/renderer_host/clipboard_message_filter_mac.mm
+++ b/content/browser/renderer_host/clipboard_message_filter_mac.mm
@@ -6,20 +6,25 @@
 
 #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 WriteFindPboardTask : public Task {
+class WriteFindPboardWrapper {
  public:
-  explicit WriteFindPboardTask(NSString* text)
+  explicit WriteFindPboardWrapper(NSString* text)
       : text_([text retain]) {}
 
   void Run() {
@@ -28,8 +33,12 @@ class WriteFindPboardTask : public Task {
 
  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) {
@@ -37,7 +46,9 @@ void ClipboardMessageFilter::OnFindPboardWriteString(const string16& text) {
     if (nsText) {
       // FindPasteboard must be used on the UI thread.
       BrowserThread::PostTask(
-          BrowserThread::UI, FROM_HERE, new WriteFindPboardTask(nsText));
+          BrowserThread::UI, FROM_HERE, base::Bind(
+              &WriteFindPboardWrapper::Run,
+              base::Owned(new WriteFindPboardWrapper(nsText))));
     }
   }
 }