Media Capabilities: rename mediacapabilities module to media_capabilities.

third_party/WebKit/Source/modules/mediacapabilities/MediaCapabilities.cpp

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "modules/mediacapabilities/MediaCapabilities.h"
-
-#include "bindings/core/v8/ScriptPromise.h"
-#include "bindings/core/v8/ScriptPromiseResolver.h"
-#include "bindings/core/v8/ScriptState.h"
-#include "modules/mediacapabilities/MediaConfiguration.h"
-#include "modules/mediacapabilities/MediaDecodingAbility.h"
-
-namespace blink {
-
-MediaCapabilities::MediaCapabilities() = default;
-
-ScriptPromise MediaCapabilities::query(
-    ScriptState* scriptState,
-    const MediaConfiguration& configuration) {
-  ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
-  ScriptPromise promise = resolver->promise();
-  resolver->resolve(new MediaDecodingAbility());
-  return promise;
-}
-
-DEFINE_TRACE(MediaCapabilities) {}
-
-}  // namespace blink