s/IsSamePage/IsSameDocument for NavigationContext.

ios/web/public/web_state/web_state_observer.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_OBSERVER_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_OBSERVER_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 42 matching lines @@
   // navigation is committed, aborted or replaced by a new one. To know if the
   // navigation has resulted in an error page, use
   // NavigationContext::IsErrorPage().
   //
   // If this is called because the navigation committed, then the document load
   // will still be ongoing in the WebState returned by |navigation_context|.
   // Use the document loads events such as DidStopLoading
   // and related methods to listen for continued events from this
   // WebState.
   //
-  // This is also fired by same-page navigations, such as fragment navigations
-  // or pushState/replaceState, which will not result in a document change. To
-  // filter these out, use NavigationContext::IsSamePage().
+  // This is also fired by same-document navigations, such as fragment
+  // navigations or pushState/replaceState, which will not result in a document
+  // change. To filter these out, use NavigationContext::IsSameDocument().
   //
   // |navigation_context| will be destroyed at the end of this call, so do not
   // keep a reference to it afterward.
   virtual void DidFinishNavigation(NavigationContext* navigation_context) {}
 
   // Called when the current page has started loading.
   virtual void DidStartLoading() {}
 
   // Called when the current page has stopped loading.
   virtual void DidStopLoading() {}
@@ skipping 107 matching lines @@
   void ResetWebState();
 
   WebState* web_state_;
 
   DISALLOW_COPY_AND_ASSIGN(WebStateObserver);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_OBSERVER_H_