Instant: Use only one hidden WebContents per profile.

chrome/browser/ui/browser.h

Index: chrome/browser/ui/browser.h
diff --git a/chrome/browser/ui/browser.h b/chrome/browser/ui/browser.h
index 7fd04a9364e82c48d1972254c34d4b3875605f41..911b25ef8168d583f12ecd25c52a7959359b689d 100644
--- a/chrome/browser/ui/browser.h
+++ b/chrome/browser/ui/browser.h
@@ -456,11 +456,10 @@ class Browser : public TabStripModelObserver,
   // Show the first run search engine bubble on the location bar.
   void ShowFirstRunBubble();
 
-  // If necessary, update the bookmark bar state according to the instant
-  // preview state: when instant preview shows suggestions and bookmark bar is
+  // If necessary, update the bookmark bar state according to the Instant
+  // overlay state: when Instant overlay shows suggestions and bookmark bar is
   // still showing attached, hide it.
-  void MaybeUpdateBookmarkBarStateForInstantPreview(
-      const chrome::search::Mode& mode);
+  void MaybeUpdateBookmarkBarStateForInstantOverlay();
 
   FullscreenController* fullscreen_controller() const {
     return fullscreen_controller_.get();