Remove code path that passes a file handle to the renderer...

net/disk_cache/mem_entry_impl.h

Index: net/disk_cache/mem_entry_impl.h
===================================================================
--- net/disk_cache/mem_entry_impl.h	(revision 17048)
+++ net/disk_cache/mem_entry_impl.h	(working copy)
@@ -29,14 +29,6 @@
   virtual int WriteData(int index, int offset, net::IOBuffer* buf, int buf_len,
                         net::CompletionCallback* completion_callback,
                         bool truncate);
-  virtual base::PlatformFile UseExternalFile(int index) {
-    // MemEntryImpl doesn't support caching to an external file.
-    return base::kInvalidPlatformFileValue;
-  }
-  virtual base::PlatformFile GetPlatformFile(int index) {
-    // MemEntryImpl doesn't support caching to an external file.
-    return base::kInvalidPlatformFileValue;
-  }
 
   // Performs the initialization of a EntryImpl that will be added to the
   // cache.