[scheduler] Do not use kInternalIPC in android_webview.

Remove kInternalIPC task type.
- If it's used to bind associated interface, use
  kInternalNavigationAssociated instead.
- If it's used to bind non-associated interface, use the task source
  mentioned in the spec or kInternalDefault if it's not speced.

R=tobiasjs@chromium.org

Change-Id: I0f1ac37df2afda909b8fe018192197cce64a0e01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906212Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Commit-Queue: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714015}

android_webview/renderer/js_java_interaction/js_java_configurator.cc

@@ -83,7 +83,8 @@ void JsJavaConfigurator::BindPendingReceiver(
     mojo::PendingAssociatedReceiver<mojom::JsJavaConfigurator>
         pending_receiver) {
   receiver_.Bind(std::move(pending_receiver),
-                 render_frame()->GetTaskRunner(blink::TaskType::kInternalIPC));
+                 render_frame()->GetTaskRunner(
+                     blink::TaskType::kInternalNavigationAssociated));
 }
 
 mojom::JsToJavaMessaging* JsJavaConfigurator::GetJsToJavaMessage(