chos: remove legacy handwriting connection to vk

Previously we were resolving a HandwritingRecognizer with
BindHandwritingRecognizer directly in the VK.

Now the VK client is using a HandwritingRecognizerRequestor to resolve
HandwritingRecognizers, thus there is no longer any need for
BindHandwritingRecognizer as it is not used.

BUG=1076172

Change-Id: I3a99d07fd7e231823ee3817708f0256c0b3d305a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340591Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Leo Zhang <googleo@chromium.org>
Commit-Queue: Curtis McMullan <curtismcmullan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795757}

chrome/browser/extensions/chrome_extensions_browser_interface_binders.cc

@@ -34,7 +34,6 @@
 #include "chromeos/services/ime/public/mojom/input_engine.mojom.h"
 #include "chromeos/services/machine_learning/public/cpp/handwriting_recognizer_manager.h"
 #include "chromeos/services/machine_learning/public/cpp/service_connection.h"
-#include "chromeos/services/machine_learning/public/mojom/handwriting_recognizer.mojom.h"
 #include "chromeos/services/machine_learning/public/mojom/handwriting_recognizer_requestor.mojom.h"
 #include "ui/base/ime/chromeos/extension_ime_util.h"
 #include "ui/base/ime/chromeos/input_method_manager.h"
@@ -62,17 +61,6 @@ void BindInputEngineManager(
       std::move(receiver));
 }
 
-void BindHandwritingRecognizer(
-    content::RenderFrameHost* render_frame_host,
-    mojo::PendingReceiver<
-        chromeos::machine_learning::mojom::HandwritingRecognizer> receiver) {
-  chromeos::machine_learning::ServiceConnection::GetInstance()
-      ->LoadHandwritingModelWithSpec(
-          chromeos::machine_learning::mojom::HandwritingRecognizerSpec::New(
-              "en"),
-          std::move(receiver), base::DoNothing());
-}
-
 void BindHandwritingRecognizerRequestor(
     content::RenderFrameHost* render_frame_host,
     mojo::PendingReceiver<
@@ -116,8 +104,6 @@ void PopulateChromeFrameBindersForExtension(
   if (extension->id() == chromeos::extension_ime_util::kXkbExtensionId) {
     binder_map->Add<chromeos::ime::mojom::InputEngineManager>(
         base::BindRepeating(&BindInputEngineManager));
-    binder_map->Add<chromeos::machine_learning::mojom::HandwritingRecognizer>(
-        base::BindRepeating(&BindHandwritingRecognizer));
     binder_map->Add<
         chromeos::machine_learning::mojom::HandwritingRecognizerRequestor>(
         base::BindRepeating(&BindHandwritingRecognizerRequestor));