Using ResourceRequestBody as the type of HTTP body outside of //content.

content/public/browser/navigation_entry.h

Index: content/public/browser/navigation_entry.h
diff --git a/content/public/browser/navigation_entry.h b/content/public/browser/navigation_entry.h
index a68e66151ba604d5b19e64a974a0d1748a674f30..92f020f9448166c6eb75d7c68032b4f3acd39280 100644
--- a/content/public/browser/navigation_entry.h
+++ b/content/public/browser/navigation_entry.h
@@ -17,6 +17,7 @@
 #include "content/common/content_export.h"
 #include "content/public/common/page_type.h"
 #include "content/public/common/referrer.h"
+#include "content/public/common/resource_request_body.h"
 #include "ui/base/page_transition_types.h"
 
 class GURL;
@@ -139,8 +140,8 @@ class NavigationEntry {
   // whether the page had post data.
   //
   // The actual post data is stored either in
-  // 1) browser_initiated_post_data when a new post data request is started.
-  // 2) content_state when a post request has started and is extracted by
+  // 1) post_data when a new post data request is started.
+  // 2) PageState when a post request has started and is extracted by
   //    WebKit to actually make the request.
   virtual void SetHasPostData(bool has_post_data) = 0;
   virtual bool GetHasPostData() const = 0;
@@ -149,16 +150,15 @@ class NavigationEntry {
   virtual void SetPostID(int64_t post_id) = 0;
   virtual int64_t GetPostID() const = 0;
 
-  // Holds the raw post data of a browser initiated post request.
-  // For efficiency, this should be cleared when content_state is populated
+  // Holds the raw post data of a post request.
+  // For efficiency, this should be cleared when PageState is populated
   // since the data is duplicated.
   // Note, this field:
   // 1) is not persisted in session restore.
   // 2) is shallow copied with the static copy Create method above.
   // 3) may be nullptr so check before use.
-  virtual void SetBrowserInitiatedPostData(
-      const base::RefCountedMemory* data) = 0;
-  virtual const base::RefCountedMemory* GetBrowserInitiatedPostData() const = 0;
+  virtual void SetPostData(const scoped_refptr<ResourceRequestBody>& data) = 0;
+  virtual scoped_refptr<ResourceRequestBody> GetPostData() const = 0;
 
   // The favicon data and tracking information. See content::FaviconStatus.
   virtual const FaviconStatus& GetFavicon() const = 0;