Fix compile error on clang

BUG=
TBR=jhorwich

Review URL: https://chromiumcodereview.appspot.com/10829347

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151751 0039d316-1c4b-4281-b951-d872f2087c98

ash/desktop_background/desktop_background_widget_controller.cc

@@ -59,6 +59,9 @@ ComponentWrapper::ComponentWrapper(
   component_.reset(component);
 }
 
+ComponentWrapper::~ComponentWrapper() {
+}
+
 DesktopBackgroundWidgetController* ComponentWrapper::GetComponent(
     bool pass_ownership) {
   if (pass_ownership)

ash/desktop_background/desktop_background_widget_controller.h

@@ -57,7 +57,7 @@ class ComponentWrapper {
  public:
   explicit ComponentWrapper(
       DesktopBackgroundWidgetController* component);
-  ~ComponentWrapper() {}
+  ~ComponentWrapper();
 
   // Gets the wrapped DesktopBackgroundWidgetController pointer. Caller should
   // take ownership of the pointer if |pass_ownership| is true.