[DevTools] Enable TCP targets discovery by default

chrome/browser/devtools/device/devtools_android_bridge_browsertest.cc

 // Copyright 2016 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 <algorithm>
 #include <array>
 
 #include "base/values.h"
 #include "chrome/browser/devtools/device/devtools_android_bridge.h"
 #include "chrome/browser/devtools/device/tcp_device_provider.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 94 matching lines @@
   EXPECT_NE(nullptr, targets);
   EXPECT_EQ(2ul, targets->GetSize());
 
   std::set<std::string> actual;
   for (size_t i = 0; i < targets->GetSize(); i++) {
     std::string value;
     targets->GetString(i, &value);
     actual.insert(value);
   }
   EXPECT_STREQ("localhost:9222, localhost:9229", SetToString(actual).c_str());
-  EXPECT_FALSE(service->GetBoolean(prefs::kDevToolsDiscoverTCPTargetsEnabled));
+  EXPECT_TRUE(service->GetBoolean(prefs::kDevToolsDiscoverTCPTargetsEnabled));
 }
 
 IN_PROC_BROWSER_TEST_F(DevToolsAndroidBridgeTest, TCPEnableChange) {
   Profile* profile = browser()->profile();
 
   PrefService* service = profile->GetPrefs();
   service->ClearPref(prefs::kDevToolsTCPDiscoveryConfig);
   service->ClearPref(prefs::kDevToolsDiscoverTCPTargetsEnabled);
 
   DevToolsAndroidBridge* bridge =
       DevToolsAndroidBridge::Factory::GetForProfile(profile);
 
   scoped_refptr<TCPDeviceProvider> provider;
   int called = 0;
   bridge->set_tcp_provider_callback_for_test(
       base::Bind(assign_from_callback, &provider, &called));
 
-  EXPECT_EQ(nullptr, provider);
+  EXPECT_NE(nullptr, provider);
 
   service->SetBoolean(prefs::kDevToolsDiscoverTCPTargetsEnabled, true);
 
   EXPECT_NE(nullptr, provider);
   EXPECT_STREQ("localhost:9222, localhost:9229",
                AllTargetsString(provider).c_str());
 
   service->SetBoolean(prefs::kDevToolsDiscoverTCPTargetsEnabled, false);
 
   EXPECT_EQ(nullptr, provider);
 }