Move full-screen detection logic from PanelManager to DisplaySettingsProvider.

chrome/browser/ui/panels/docked_panel_strip.cc

Index: chrome/browser/ui/panels/docked_panel_strip.cc
diff --git a/chrome/browser/ui/panels/docked_panel_strip.cc b/chrome/browser/ui/panels/docked_panel_strip.cc
index 5753783abb130ddcd2d4e5d59f6c30fb42543851..ad9118f9fe4200452715fab5a05e4bc5e6b19d61 100644
--- a/chrome/browser/ui/panels/docked_panel_strip.cc
+++ b/chrome/browser/ui/panels/docked_panel_strip.cc
@@ -61,13 +61,14 @@ DockedPanelStrip::DockedPanelStrip(PanelManager* panel_manager)
       delayed_titlebar_action_(NO_ACTION),
       titlebar_action_factory_(this) {
   dragging_panel_current_iterator_ = panels_.end();
-  panel_manager_->display_settings_provider()->set_desktop_bar_observer(this);
+  panel_manager_->display_settings_provider()->AddDesktopBarObserver(this);
 }
 
 DockedPanelStrip::~DockedPanelStrip() {
   DCHECK(panels_.empty());
   DCHECK(panels_in_temporary_layout_.empty());
   DCHECK_EQ(0, minimized_panel_count_);
+  panel_manager_->display_settings_provider()->RemoveDesktopBarObserver(this);
 }
 
 void DockedPanelStrip::SetDisplayArea(const gfx::Rect& display_area) {