FBTF: Move the TabRestoreService::Observer into its own file.

chrome/browser/sessions/session_types.h

Index: chrome/browser/sessions/session_types.h
diff --git a/chrome/browser/sessions/session_types.h b/chrome/browser/sessions/session_types.h
index 07dbae4f68af35b485c431268db231df01ab3056..119392a17f6ef94c5c74d0fcfa7c98da3d219ec9 100644
--- a/chrome/browser/sessions/session_types.h
+++ b/chrome/browser/sessions/session_types.h
@@ -31,25 +31,16 @@ class TabNavigation {
     HAS_POST_DATA = 1
   };
 
-  TabNavigation()
-      : transition_(PageTransition::TYPED),
-        type_mask_(0),
-        index_(-1) {
-  }
-
+  TabNavigation();
   TabNavigation(int index,
                 const GURL& virtual_url,
                 const GURL& referrer,
                 const string16& title,
                 const std::string& state,
-                PageTransition::Type transition)
-      : virtual_url_(virtual_url),
-        referrer_(referrer),
-        title_(title),
-        state_(state),
-        transition_(transition),
-        type_mask_(0),
-        index_(index) {}
+                PageTransition::Type transition);
+  TabNavigation(const TabNavigation& tab);
+  ~TabNavigation();
+  TabNavigation& operator=(const TabNavigation& tab);
 
   // Converts this TabNavigation into a NavigationEntry with a page id of
   // |page_id|. The caller owns the returned NavigationEntry.
@@ -107,10 +98,8 @@ class TabNavigation {
 
 // SessionTab corresponds to a NavigationController.
 struct SessionTab {
-  SessionTab()
-      : tab_visual_index(-1),
-        current_navigation_index(-1),
-        pinned(false) { }
+  SessionTab();
+  ~SessionTab();
 
   // Unique id of the window.
   SessionID window_id;