URLRequestContext and disk cache for media files

net/disk_cache/mem_entry_impl.h

Index: net/disk_cache/mem_entry_impl.h
diff --git a/net/disk_cache/mem_entry_impl.h b/net/disk_cache/mem_entry_impl.h
index cd8c6e74796816f0912f59a7b1c2175f0b253dd0..63235f975feeabf3c9a10e83bf0da427c3b9dd39 100644
--- a/net/disk_cache/mem_entry_impl.h
+++ b/net/disk_cache/mem_entry_impl.h
@@ -29,6 +29,14 @@ class MemEntryImpl : public Entry {
   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.