PlzNavigate: make content unit tests work with browser side navigation

content/browser/frame_host/navigation_request.h

Index: content/browser/frame_host/navigation_request.h
diff --git a/content/browser/frame_host/navigation_request.h b/content/browser/frame_host/navigation_request.h
index 02058bed7ef5880e086a9bbb2c27c62b492b3d18..649e62885c4775bb9b62e6cf8cae7ee0822abda0 100644
--- a/content/browser/frame_host/navigation_request.h
+++ b/content/browser/frame_host/navigation_request.h
@@ -11,6 +11,7 @@
 #include "content/browser/frame_host/navigation_entry_impl.h"
 #include "content/browser/loader/navigation_url_loader_delegate.h"
 #include "content/common/content_export.h"
+#include "content/common/frame_message_enums.h"
 #include "content/common/navigation_params.h"
 
 namespace content {
@@ -51,6 +52,12 @@ class CONTENT_EXPORT NavigationRequest : public NavigationURLLoaderDelegate {
     FAILED,
   };
 
+  static scoped_ptr<NavigationRequest> Create(
+    FrameTreeNode* frame_tree_node,
+    const NavigationEntryImpl& entry,
+    FrameMsg_Navigate_Type::Value navigation_type,
+    base::TimeTicks navigation_start);
+
   NavigationRequest(FrameTreeNode* frame_tree_node,
                     const CommonNavigationParams& common_params,
                     const CommitNavigationParams& commit_params,