Fix Clang error on SettingChange.

chrome/browser/protector/setting_change.h

Index: chrome/browser/protector/setting_change.h
diff --git a/chrome/browser/protector/setting_change.h b/chrome/browser/protector/setting_change.h
index 63e4261d81d252d0c1d2f931f79c5fe68081bdc8..6f6f6dc04e86a2f9b14e8d45b2d372a871d4ea75 100644
--- a/chrome/browser/protector/setting_change.h
+++ b/chrome/browser/protector/setting_change.h
@@ -21,19 +21,19 @@ class Protector;
 // Base class for setting change tracked by Protector.
 class SettingChange {
  public:
-  SettingChange() {}
-  virtual ~SettingChange() {}
+  SettingChange();
+  virtual ~SettingChange();
 
   // Applies initial actions to the setting if needed. Must be called before
   // any other calls are made, including text getters. Returns true if
   // initialization was successful.
-  virtual bool Init(Protector* protector) { return true; }
+  virtual bool Init(Protector* protector);
 
   // Persists new setting if needed.
-  virtual void Apply(Protector* protector) {}
+  virtual void Apply(Protector* protector);
 
   // Restores old setting if needed.
-  virtual void Discard(Protector* protector) {}
+  virtual void Discard(Protector* protector);
 
   // Returns the wrench menu item and bubble title.
   virtual string16 GetTitle() const = 0;