Instant: Use only one hidden WebContents per profile.

chrome/common/chrome_notification_types.h

Index: chrome/common/chrome_notification_types.h
diff --git a/chrome/common/chrome_notification_types.h b/chrome/common/chrome_notification_types.h
index fc9cedfdba8ea6ebd57c01d965395efdc6e0e8f7..27990f642bf80ec0bf132a77077a09b7ef3cb88d 100644
--- a/chrome/common/chrome_notification_types.h
+++ b/chrome/common/chrome_notification_types.h
@@ -1097,25 +1097,13 @@ enum NotificationType {
   // Send when a context menu is closed.
   NOTIFICATION_RENDER_VIEW_CONTEXT_MENU_CLOSED,
 
-  // Sent each time the InstantController is updated.
-  NOTIFICATION_INSTANT_CONTROLLER_UPDATED,
+  // Sent each time a search query is sent to an Instant page.
+  NOTIFICATION_INSTANT_UPDATED,
 
-  // Sent when an Instant preview is committed. The Source is the WebContents
-  // containing the committed preview.
+  // Sent when an Instant overlay is committed. The Source is the WebContents
+  // containing the committed overlay.
   NOTIFICATION_INSTANT_COMMITTED,
 
-  // Sent when the Instant Controller determines whether the overlay supports
-  // the Instant API or not.
-  NOTIFICATION_INSTANT_OVERLAY_SUPPORT_DETERMINED,
-
-  // Sent when the Instant Controller determines whether the NTP supports the
-  // Instant API or not.
-  NOTIFICATION_INSTANT_NTP_SUPPORT_DETERMINED,
-
-  // Sent when the Instant Controller has sent the Most Visited Items to the
-  // renderer.
-  NOTIFICATION_INSTANT_SENT_MOST_VISITED_ITEMS,
-
   // Sent when the CaptivePortalService checks if we're behind a captive portal.
   // The Source is the Profile the CaptivePortalService belongs to, and the
   // Details are a Details<CaptivePortalService::CheckResults>.
@@ -1259,5 +1247,4 @@ enum NotificationType {
 
 }  // namespace chrome
 
-
 #endif  // CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_