loading: Remove unused method BytesConsumer::Tee().

It looks like this was accidentally added in
https://chromium-review.googlesource.com/c/chromium/src/+/1417431.

There is another blink::BytesConsumerTee() to use instead.

Change-Id: I45db617f249405c7886f0edd111e7092ea779961
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2389804Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803810}

third_party/blink/renderer/core/fetch/form_data_bytes_consumer.h

@@ -16,6 +16,7 @@ namespace blink {
 class DOMArrayBuffer;
 class DOMArrayBufferView;
 class EncodedFormData;
+class ExecutionContext;
 
 class FormDataBytesConsumer final : public BytesConsumer {
  public:

third_party/blink/renderer/platform/loader/fetch/bytes_consumer.h

@@ -16,8 +16,6 @@
 
 namespace blink {
 
-class ExecutionContext;
-
 // BytesConsumer represents the "consumer" side of a data pipe. A user
 // can read data from it.
 //
@@ -165,14 +163,6 @@ class PLATFORM_EXPORT BytesConsumer : public GarbageCollected<BytesConsumer> {
   // implementation for debug purpose.
   virtual String DebugName() const = 0;
 
-  // Creates two BytesConsumer both of which represent the data sequence that
-  // would be read from |src| and store them to |*dest1| and |*dest2|.
-  // |src| must not have a client when called.
-  static void Tee(ExecutionContext*,
-                  BytesConsumer* src,
-                  BytesConsumer** dest1,
-                  BytesConsumer** dest2);
-
   // Returns a BytesConsumer whose state is Closed.
   static BytesConsumer* CreateClosed();