Clean-up after moving ScopedSysTraceEvent to base

This should be landed after the upstream fix
https://chromium-review.googlesource.com/c/chromium/src/+/1730313
and the downstream fix
https://chrome-internal-review.googlesource.com/c/clank/internal/apps/+/1560327
land.

Bug: 817644
Change-Id: I66a986374804b8e6642275ee08c2412458c12258
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730781Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Changwan Ryu <changwan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683644}

android_webview/BUILD.gn

@@ -865,7 +865,6 @@ android_library("android_webview_java") {
     "java/src/org/chromium/android_webview/OverScrollGlow.java",
     "java/src/org/chromium/android_webview/PopupTouchHandleDrawable.java",
     "java/src/org/chromium/android_webview/ResourcesContextWrapperFactory.java",
-    "java/src/org/chromium/android_webview/ScopedSysTraceEvent.java",
     "java/src/org/chromium/android_webview/ScrollAccessibilityHelper.java",
     "java/src/org/chromium/android_webview/SslUtil.java",
     "java/src/org/chromium/android_webview/VariationsSeedLoader.java",

android_webview/java/src/org/chromium/android_webview/ScopedSysTraceEvent.java

-// Copyright 2018 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.
-
-package org.chromium.android_webview;
-
-import android.os.Trace;
-
-// TODO(changwan): remove this file once downstream change lands.
-/**
- * An alternative to @{TraceEvent} that allows us to trace events before native
- * initialization.
- *
- * Note that TraceEvent / EarlyTraceEvent cannot be used before native initialization since
- * it directly purges to the kernel debug message but that method does not allow tracing events
- * to be written *after* the event occurrence.
- */
-public class ScopedSysTraceEvent implements AutoCloseable {
-    /**
-     * Factory used to support the "try with resource" construct.
-     * Note that currently this is the only allowed pattern. However, this requires heap allocation
-     * so we may consider calling Trace.beginSection() / endSection() directly if it should be used
-     * repeatedly.
-     *
-     * @param name Trace event name.
-     * @return a {@ScopedSysTraceEvent}, or null if tracing is not enabled.
-     */
-    public static ScopedSysTraceEvent scoped(String name) {
-        return new ScopedSysTraceEvent(name);
-    }
-
-    /**
-     * Constructor used to support the "try with resource" construct.
-     */
-    private ScopedSysTraceEvent(String name) {
-        Trace.beginSection(name);
-    }
-
-    @Override
-    public void close() {
-        Trace.endSection();
-    }
-}