Move Extension Location and Type enums to Manifest, and move InstallWarning to its own file.

chrome/common/extensions/extension_messages.h

 // Copyright (c) 2012 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.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
@@ skipping 145 matching lines @@
   ~ExtensionMsg_Loaded_Params();
   explicit ExtensionMsg_Loaded_Params(const extensions::Extension* extension);
 
   // Creates a new extension from the data in this object.
   scoped_refptr<extensions::Extension> ConvertToExtension() const;
 
   // The subset of the extension manifest data we send to renderers.
   linked_ptr<DictionaryValue> manifest;
 
   // The location the extension was installed from.
-  extensions::Extension::Location location;
+  extensions::Manifest::Location location;
 
   // The path the extension was loaded from. This is used in the renderer only
   // to generate the extension ID for extensions that are loaded unpacked.
   FilePath path;
 
   // The extension's active permissions.
   extensions::APIPermissionSet apis;
   extensions::URLPatternSet explicit_hosts;
   extensions::URLPatternSet scriptable_hosts;
 
@@ skipping 414 matching lines @@
 // Notifies the browser process that a tab has started or stopped matching
 // certain conditions.  This message is sent in response to several events:
 //
 // * ExtensionMsg_WatchPages was received, updating the set of conditions.
 // * A new page is loaded.  This will be sent after ViewHostMsg_FrameNavigate.
 //   Currently this only fires for the main frame.
 // * Something changed on an existing frame causing the set of matching searches
 //   to change.
 IPC_MESSAGE_ROUTED1(ExtensionHostMsg_OnWatchedPageChange,
                     std::vector<std::string> /* Matching CSS selectors */)