GTTF: Add missing virtual destructors.

R=jar
TBR=darin,satorux,fischman,jamesr,sky

BUG=45135

Review URL: https://codereview.chromium.org/12086018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180669 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 0 deletions

diff --git a/chrome/browser/ui/panels/display_settings_provider.h b/chrome/browser/ui/panels/display_settings_provider.h
index 61a7a99..bad4502 100644
--- a/chrome/browser/ui/panels/display_settings_provider.h
+++ b/chrome/browser/ui/panels/display_settings_provider.h
@@ -32,17 +32,23 @@ class DisplaySettingsProvider {
 
   class DisplayAreaObserver {
    public:
+    virtual ~DisplayAreaObserver() { }
+
     virtual void OnDisplayAreaChanged(const gfx::Rect& display_area) = 0;
   };
 
   class DesktopBarObserver {
    public:
+    virtual ~DesktopBarObserver() { }
+
     virtual void OnAutoHidingDesktopBarVisibilityChanged(
         DesktopBarAlignment alignment, DesktopBarVisibility visibility) = 0;
   };
 
   class FullScreenObserver {
    public:
+    virtual ~FullScreenObserver() { }
+
     virtual void OnFullScreenModeChanged(bool is_full_screen) = 0;
   };