[fuchsia] Remove Mojo<->FIDL MessagePort bridge.

Remove the legacy Mojo-based fuchsia.web.MessagePort bridge
implementations, which are no longer used.

Bug: 803242
Change-Id: Ieb93f483586c10f72dadc9195212836bf2d228aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124386
Auto-Submit: Wez <wez@chromium.org>
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754759}

fuchsia/base/message_port.h

@@ -6,37 +6,14 @@
 #define FUCHSIA_BASE_MESSAGE_PORT_H_
 
 #include <fuchsia/web/cpp/fidl.h>
-#include <lib/fidl/cpp/binding.h>
+#include <lib/fidl/cpp/interface_handle.h>
+#include <lib/fidl/cpp/interface_request.h>
 #include <memory>
 
-#include "base/containers/circular_deque.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "mojo/public/cpp/bindings/connector.h"
-#include "mojo/public/cpp/bindings/message.h"
-#include "mojo/public/cpp/system/message_pipe.h"
 #include "third_party/blink/public/common/messaging/web_message_port.h"
 
 namespace cr_fuchsia {
 
-// TODO(crbug.com/803242): Once all downstream dependencies have migrated to
-// using blink::WebMessagePort variants of this API, remove the mojo variants.
-
-// Creates a connected MessagePort from a FIDL MessagePort request and
-// returns a handle to its peer Mojo pipe.
-mojo::ScopedMessagePipeHandle MessagePortFromFidl(
-    fidl::InterfaceRequest<fuchsia::web::MessagePort> fidl_port);
-
-// Creates a connected MessagePort from a remote FIDL MessagePort handle,
-// returns a handle to its peer Mojo pipe.
-mojo::ScopedMessagePipeHandle MessagePortFromFidl(
-    fidl::InterfaceHandle<fuchsia::web::MessagePort> fidl_port);
-
-// Creates a connected MessagePort from a transferred Mojo MessagePort and
-// returns a handle to its FIDL interface peer.
-fidl::InterfaceHandle<fuchsia::web::MessagePort> MessagePortFromMojo(
-    mojo::ScopedMessagePipeHandle mojo_port);
-
 // Creates a connected MessagePort from a FIDL MessagePort request and
 // returns a handle to its peer blink::WebMessagePort.
 blink::WebMessagePort BlinkMessagePortFromFidl(