Revert of Turn on MojoChannel

content/public/common/mojo_channel_switches.cc

 // Copyright 2015 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/public/common/mojo_channel_switches.h"
 
+#include "base/command_line.h"
+#include "base/metrics/field_trial.h"
+#include "base/strings/string_util.h"
 #include "ipc/mojo/ipc_channel_mojo.h"
+#include "mojo/common/common_type_converters.h"
 
 namespace switches {
 
+// Enable ChannelMojo on any supported platform.
+const char kEnableMojoChannel[] = "enable-mojo-channel";
+
 // The token to use to construct the message pipe on which to layer ChannelMojo.
 const char kMojoChannelToken[] = "mojo-channel-token";
 
 // The token to use to construct the message pipe for MojoApplication.
 const char kMojoApplicationChannelToken[] = "mojo-application-channel-token";
 
 }  // namespace switches
+
+namespace {
+
+const char kMojoChannelExperimentName[] = "MojoChannel";
+
+}  // namespace
+
+namespace content {
+
+bool ShouldUseMojoChannel() {
+  const std::string group =
+      base::FieldTrialList::FindFullName(kMojoChannelExperimentName);
+
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableMojoChannel))
+    return true;
+
+  return base::StartsWith(
+      group, "Enabled", base::CompareCase::INSENSITIVE_ASCII);
+}
+
+}  // namespace content