Move navigation and frame tree classes to a new frame_host/ directory.

content/browser/frame_host/navigation_controller_impl.h

Index: content/browser/frame_host/navigation_controller_impl.h
diff --git a/content/browser/web_contents/navigation_controller_impl.h b/content/browser/frame_host/navigation_controller_impl.h
similarity index 98%
rename from content/browser/web_contents/navigation_controller_impl.h
rename to content/browser/frame_host/navigation_controller_impl.h
index 1aad311b95724dc02c858491ebf025c3c99813ef..b180a7452e1394acc4dc322ff2f59565409c2206 100644
--- a/content/browser/web_contents/navigation_controller_impl.h
+++ b/content/browser/frame_host/navigation_controller_impl.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_
-#define CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_
+#ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
+#define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
@@ -11,8 +11,8 @@
 #include "base/memory/linked_ptr.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
+#include "content/browser/frame_host/navigation_controller_delegate.h"
 #include "content/browser/ssl/ssl_manager.h"
-#include "content/browser/web_contents/navigation_controller_delegate.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_type.h"
 
@@ -407,4 +407,4 @@ class CONTENT_EXPORT NavigationControllerImpl
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_
+#endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_