Remember the clear browsing data combo box selection.

chrome/browser/views/clear_browsing_data.h

Index: chrome/browser/views/clear_browsing_data.h
===================================================================
--- chrome/browser/views/clear_browsing_data.h	(revision 3843)
+++ chrome/browser/views/clear_browsing_data.h	(working copy)
@@ -34,6 +34,7 @@
                               public views::DialogDelegate,
                               public views::ComboBox::Model,
                               public views::NativeButton::Listener,
+                              public views::ComboBox::Listener,
                               public BrowsingDataRemover::Observer {
  public:
   explicit ClearBrowsingDataView(Profile* profile);
@@ -68,6 +69,10 @@
   // Overridden from views::NativeButton::Listener:
   virtual void ButtonPressed(views::NativeButton* sender);
 
+   // Overridden from views::ComboBox::Listener:
+  virtual void ItemChanged(views::ComboBox* sender, int prev_index,
+                           int new_index);
+
  private:
   // Adds a new check-box as a child to the view.
   views::CheckBox* AddCheckbox(const std::wstring& text, bool checked);