Fix a crash in PasswordManagerExceptionsView

chrome/browser/views/password_manager_view.h

Index: chrome/browser/views/password_manager_view.h
diff --git a/chrome/browser/views/password_manager_view.h b/chrome/browser/views/password_manager_view.h
index a5e59505c46957d19e4359ff9dfc41bc8c2a8a37..6454db0bcaec4f770f70e1a2ba037822dd2734d8 100644
--- a/chrome/browser/views/password_manager_view.h
+++ b/chrome/browser/views/password_manager_view.h
@@ -20,6 +20,21 @@
 
 class Profile;
 
+// An observer interface to notify change of row count in a table model. This
+// allow the container view of TableView(i.e. PasswordManagerView and
+// PasswordManagerExceptionsView), to be notified of row count changes directly
+// from the TableModel. We have two different observers in
+// PasswordManagerTableModel, namely views::TableModelObserver and
+// PasswordManagerTableModelObserver, rather than adding this event to
+// views::TableModelObserver because only container view of
+// PasswordManagerTableModel cares about this event. Because of the same reason
+// the relationship between a PasswordManagerTableModel and
+// PasswordManagerTableModelObserver is 1-to-1.
+class PasswordManagerTableModelObserver {
+ public:
+  virtual void OnRowCountChanged(size_t rows) = 0;
+};
+
 class PasswordManagerTableModel : public views::TableModel,
                                   public WebDataServiceConsumer {
  public:
@@ -49,6 +64,11 @@ class PasswordManagerTableModel : public views::TableModel,
   // Return the PasswordForm at the specified index.
   PasswordForm* GetPasswordFormAt(int row);
 
+  // Set the observer who concerns about how many rows are in the table.
+  void set_row_count_observer(PasswordManagerTableModelObserver* observer) {
+    row_count_observer_ = observer;
+  }
+
  protected:
   // Wraps the PasswordForm from the database and caches the display URL for
   // quick sorting.
@@ -72,6 +92,10 @@ class PasswordManagerTableModel : public views::TableModel,
   // The TableView observing this model.
   views::TableModelObserver* observer_;
 
+  // Dispatching row count events specific to this password manager table model
+  // to this observer.
+  PasswordManagerTableModelObserver* row_count_observer_;
+
   // Handle to any pending WebDataService::GetLogins query.
   WebDataService::Handle pending_login_query_;
 
@@ -108,7 +132,8 @@ class MultiLabelButtons : public views::NativeButton {
 class PasswordManagerView : public views::View,
                             public views::DialogDelegate,
                             public views::TableViewObserver,
-                            public views::NativeButton::Listener {
+                            public views::NativeButton::Listener,
+                            public PasswordManagerTableModelObserver {
  public:
   explicit PasswordManagerView(Profile* profile);
   virtual ~PasswordManagerView();
@@ -121,8 +146,6 @@ class PasswordManagerView : public views::View,
   virtual gfx::Size GetPreferredSize();
   virtual void ViewHierarchyChanged(bool is_add, views::View* parent,
                                     views::View* child);
-  virtual void SetRemoveAllEnabled(bool enabled);
-
   // views::TableViewObserver implementation.
   virtual void OnSelectionChanged();
 
@@ -139,6 +162,9 @@ class PasswordManagerView : public views::View,
   virtual void WindowClosing();
   virtual views::View* GetContentsView();
 
+  // PasswordManagerTableModelObserver implementation.
+  virtual void OnRowCountChanged(size_t rows);
+
  private:
   // Wire up buttons, the model, and the table view, and query the DB for
   // saved login data tied to the given profile.
@@ -160,6 +186,8 @@ class PasswordManagerView : public views::View,
   views::NativeButton remove_all_button_;
   views::Label password_label_;
 
+  static PasswordManagerView* instance_;
+
   DISALLOW_EVIL_CONSTRUCTORS(PasswordManagerView);
 };
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_VIEW_H__