Added some public methods to web::NavigationController.

ios/web/navigation/navigation_manager_impl.mm

Index: ios/web/navigation/navigation_manager_impl.mm
diff --git a/ios/web/navigation/navigation_manager_impl.mm b/ios/web/navigation/navigation_manager_impl.mm
index 53e60291a8f18b5d2526b95bebef65e90891d50b..c7a2d74c91a773256f02987f018cabee448377a6 100644
--- a/ios/web/navigation/navigation_manager_impl.mm
+++ b/ios/web/navigation/navigation_manager_impl.mm
@@ -143,25 +143,12 @@ NavigationItem* NavigationManagerImpl::GetLastCommittedItem() const {
   return [entry navigationItem];
 }
 
-NavigationItem* NavigationManagerImpl::GetItemAtIndex(size_t index) const {
-  NSArray* entries =  [session_controller_ entries];
-  return index < entries.count ? [entries[index] navigationItem] : nullptr;
-}
-
-int NavigationManagerImpl::GetCurrentEntryIndex() const {
-  return [session_controller_ currentNavigationIndex];
-}
-
 int NavigationManagerImpl::GetLastCommittedEntryIndex() const {
   if (![[session_controller_ entries] count])
     return -1;
   return [session_controller_ currentNavigationIndex];
 }
 
-int NavigationManagerImpl::GetEntryCount() const {
-  return [[session_controller_ entries] count];
-}
-
 bool NavigationManagerImpl::RemoveEntryAtIndex(int index) {
   if (index == GetLastCommittedEntryIndex() ||
       index == GetPendingEntryIndex())
@@ -202,6 +189,19 @@ void NavigationManagerImpl::AddTransientURLRewriter(
   transient_url_rewriters_->push_back(rewriter);
 }
 
+int NavigationManagerImpl::GetEntryCount() const {
+  return [[session_controller_ entries] count];
+}
+
+NavigationItem* NavigationManagerImpl::GetItemAtIndex(size_t index) const {
+  NSArray* entries = [session_controller_ entries];
+  return index < entries.count ? [entries[index] navigationItem] : nullptr;
+}
+
+int NavigationManagerImpl::GetCurrentEntryIndex() const {
+  return [session_controller_ currentNavigationIndex];
+}
+
 scoped_ptr<std::vector<BrowserURLRewriter::URLRewriter>>
 NavigationManagerImpl::GetTransientURLRewriters() {
   return transient_url_rewriters_.Pass();