Revert of arc: enable Android tracing from chrome://tracing in dev mode

content/browser/tracing/arc_tracing_agent.cc

Index: content/browser/tracing/arc_tracing_agent.cc
diff --git a/content/browser/tracing/arc_tracing_agent.cc b/content/browser/tracing/arc_tracing_agent.cc
deleted file mode 100644
index d71cd647ae870308c2d5c68e3f600c2345115814..0000000000000000000000000000000000000000
--- a/content/browser/tracing/arc_tracing_agent.cc
+++ /dev/null
@@ -1,100 +0,0 @@
-// 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 "content/browser/tracing/arc_tracing_agent.h"
-
-#include <string>
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "base/memory/singleton.h"
-#include "base/threading/thread_checker.h"
-#include "base/threading/thread_task_runner_handle.h"
-
-namespace content {
-
-namespace {
-
-constexpr char kArcTracingAgentName[] = "arc";
-constexpr char kArcTraceLabel[] = "ArcTraceEvents";
-
-void OnStopTracing(bool success) {
-  DLOG_IF(WARNING, !success) << "Failed to stop ARC tracing.";
-}
-
-class ArcTracingAgentImpl : public ArcTracingAgent {
- public:
-  // base::trace_event::TracingAgent overrides:
-  std::string GetTracingAgentName() override { return kArcTracingAgentName; }
-
-  std::string GetTraceEventLabel() override { return kArcTraceLabel; }
-
-  void StartAgentTracing(const base::trace_event::TraceConfig& trace_config,
-                         const StartAgentTracingCallback& callback) override {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    // delegate_ may be nullptr if ARC is not enabled on the system. In such
-    // case, simply do nothing.
-    if (!delegate_) {
-      // Use PostTask as the convention of TracingAgent. The caller expects
-      // callback to be called after this function returns.
-      base::ThreadTaskRunnerHandle::Get()->PostTask(
-          FROM_HERE, base::Bind(callback, GetTracingAgentName(), false));
-      return;
-    }
-
-    delegate_->StartTracing(trace_config,
-                            base::Bind(callback, GetTracingAgentName()));
-  }
-
-  void StopAgentTracing(const StopAgentTracingCallback& callback) override {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    if (delegate_)
-      delegate_->StopTracing(base::Bind(OnStopTracing));
-
-    // Trace data is collect via systrace (debugd) in dev-mode. Simply
-    // return empty data here.
-    std::string no_data;
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE,
-        base::Bind(callback, GetTracingAgentName(), GetTraceEventLabel(),
-                   base::RefCountedString::TakeString(&no_data)));
-  }
-
-  // ArcTracingAgent overrides:
-  void SetDelegate(Delegate* delegate) override {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    delegate_ = delegate;
-  }
-
-  static ArcTracingAgentImpl* GetInstance() {
-    return base::Singleton<ArcTracingAgentImpl>::get();
-  }
-
- private:
-  // This allows constructor and destructor to be private and usable only
-  // by the Singleton class.
-  friend struct base::DefaultSingletonTraits<ArcTracingAgentImpl>;
-
-  ArcTracingAgentImpl() = default;
-  ~ArcTracingAgentImpl() override = default;
-
-  Delegate* delegate_ = nullptr;  // Owned by ArcServiceLauncher.
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(ArcTracingAgentImpl);
-};
-
-}  // namespace
-
-// static
-ArcTracingAgent* ArcTracingAgent::GetInstance() {
-  return ArcTracingAgentImpl::GetInstance();
-}
-
-ArcTracingAgent::ArcTracingAgent() = default;
-ArcTracingAgent::~ArcTracingAgent() = default;
-
-ArcTracingAgent::Delegate::~Delegate() = default;
-
-}  // namespace content