Instant: Use only one hidden WebContents per profile.

chrome/browser/instant/instant_model_observer.h

Index: chrome/browser/instant/instant_model_observer.h
diff --git a/chrome/browser/instant/instant_model_observer.h b/chrome/browser/instant/instant_model_observer.h
index 1985fcc177eab45dfd4adb69cd8dc472f8a8434b..2a208f305991dead7d38d76d9c350eeae8b47b69 100644
--- a/chrome/browser/instant/instant_model_observer.h
+++ b/chrome/browser/instant/instant_model_observer.h
@@ -7,12 +7,12 @@
 
 class InstantModel;
 
-// This class defines the observer interface for the |InstantModel|.
+// This class defines the observer interface for the InstantModel.
 class InstantModelObserver {
  public:
-  // Informs the observer that the preview state has changed. This can mean
-  // either the model state changed or the contents of the preview changed.
-  virtual void PreviewStateChanged(const InstantModel& model) = 0;
+  // Informs the observer that the overlay state has changed. This can mean
+  // either the model state changed or the contents of the overlay changed.
+  virtual void OverlayStateChanged(const InstantModel& model) = 0;
 
  protected:
   ~InstantModelObserver() {}