Remove deprecated APIs from WebDataConsumerHandle.

public/platform/WebDataConsumerHandle.h

Index: public/platform/WebDataConsumerHandle.h
diff --git a/public/platform/WebDataConsumerHandle.h b/public/platform/WebDataConsumerHandle.h
index cba7e9746f4ebf8ed6cb0a4fd84bdc97ece00f89..ae26723f53438e2a5a0c6c6abba1fa37702e321e 100644
--- a/public/platform/WebDataConsumerHandle.h
+++ b/public/platform/WebDataConsumerHandle.h
@@ -120,39 +120,6 @@ private:
         BLINK_ASSERT_NOT_REACHED();
         return nullptr;
     }
-
-    // Below are deprecated functions that will be removed shortly. Use Reader
-    // instead.
-public:
-    // Note: read / beginRead / endRead / unregisterClient must not be called
-    // when a client is regsitered. They must be called on the thread on which
-    // registerClient is called. registerClient must not be called when a client
-    // is already registered.
-
-    // Reads data into |data| up to |size| bytes. The actual read size will be
-    // stored in |*readSize|. This function cannot be called when a two-phase
-    // read is in progress.
-    // Returns Done when it reaches to the end of the data.
-    virtual Result read(void* data, size_t /* size */, Flags, size_t* readSize) { return UnexpectedError; }
-
-    // Begins a two-phase read. On success, the function stores a buffer that
-    // contains the read data of length |*available| into |*buffer|.
-    // Returns Done when it reaches to the end of the data.
-    // On fail, you don't have to (and should not) call endRead, because the
-    // read session implicitly ends in that case.
-    virtual Result beginRead(const void** buffer, Flags, size_t* available) { return UnexpectedError; }
-
-    // Ends a two-phase read.
-    // |readSize| indicates the actual read size.
-    virtual Result endRead(size_t readSize) { return UnexpectedError; }
-
-    // Registers |client| to this handle. The client must not be null and must
-    // be valid until it is unregistered (or the handle is destructed).
-    // Only one registration can be made for a handle at a time.
-    virtual void registerClient(Client* /* client */)  { }
-
-    // Unregisters |client| from this handle.
-    virtual void unregisterClient() { }
 };
 
 } // namespace blink