Mandoline: Move ContentHandlerConnection into separate file

mojo/shell/application_manager.h

Index: mojo/shell/application_manager.h
diff --git a/mojo/shell/application_manager.h b/mojo/shell/application_manager.h
index 727b9e6e8c523abe187cd9a786da6d69bcf4c802..aee1e095140b362c2966159486dcce798a3613e7 100644
--- a/mojo/shell/application_manager.h
+++ b/mojo/shell/application_manager.h
@@ -31,6 +31,7 @@ class SequencedWorkerPool;
 namespace mojo {
 namespace shell {
 
+class ContentHandlerConnection;
 class ShellImpl;
 
 class ApplicationManager {
@@ -143,9 +144,11 @@ class ApplicationManager {
   // Removes a ShellImpl when it encounters an error.
   void OnShellImplError(ShellImpl* shell_impl);
 
- private:
-  class ContentHandlerConnection;
+  // Removes a ContentHandler when its connection is closed.
+  void OnContentHandlerConnectionClosed(
+      ContentHandlerConnection* content_handler);
 
+ private:
   using ApplicationPackagedAlias = std::map<GURL, std::pair<GURL, std::string>>;
   using IdentityToShellImplMap = std::map<Identity, ShellImpl*>;
   using MimeTypeToURLMap = std::map<std::string, GURL>;
@@ -223,9 +226,6 @@ class ApplicationManager {
   // configured for the URL.
   ApplicationLoader* GetLoaderForURL(const GURL& url);
 
-  // Removes a ContentHandler when it encounters an error.
-  void OnContentHandlerError(ContentHandlerConnection* content_handler);
-
   void CleanupRunner(NativeRunner* runner);
 
   Delegate* const delegate_;