[DevTools] Move target-related methods from DevToolsHttpHandlerDelegate to DevToolsManagerDelegate.

chrome/browser/devtools/BUILD.gn

 # Copyright 2014 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.
 
 action("devtools_protocol_constants") {
   script = "//content/public/browser/devtools_protocol_constants_generator.py"
 
   blink_protocol = "//third_party/WebKit/Source/devtools/protocol.json"
   browser_protocol = "//content/browser/devtools/browser_protocol.json"
   inputs = [ blink_protocol, browser_protocol ]
   outputs = [
     "$target_gen_dir/devtools_protocol_constants.cc",
     "$target_gen_dir/devtools_protocol_constants.h",
   ]
 
   args = [ "chrome" ]
   args += rebase_path(outputs, root_build_dir)
   args += [ rebase_path(blink_protocol, root_build_dir) ]
   args += [ rebase_path(browser_protocol, root_build_dir) ]
 }
 
 # GYP version: chrome/chrome_debugger.gypi:debugger
 static_library("devtools") {
   # Note: new sources and deps should be generally added in (!is_android) below.
   sources = [
-    "chrome_devtools_manager_delegate.cc",
-    "chrome_devtools_manager_delegate.h",
     "devtools_network_conditions.cc",
     "devtools_network_conditions.h",
     "devtools_network_controller.cc",
     "devtools_network_controller.h",
     "devtools_network_interceptor.cc",
     "devtools_network_interceptor.h",
     "devtools_network_protocol_handler.cc",
     "devtools_network_protocol_handler.h",
     "devtools_network_transaction.cc",
     "devtools_network_transaction.h",
@@ skipping 56 matching lines @@
       "device/usb/android_rsa.cc",
       "device/usb/android_rsa.h",
       "device/usb/android_usb_device.cc",
       "device/usb/android_usb_device.h",
       "device/usb/android_usb_socket.cc",
       "device/usb/android_usb_socket.h",
       "device/usb/usb_device_provider.cc",
       "device/usb/usb_device_provider.h",
       "browser_list_tabcontents_provider.cc",
       "browser_list_tabcontents_provider.h",
+      "chrome_devtools_manager_delegate.cc",
+      "chrome_devtools_manager_delegate.h",
       "devtools_contents_resizing_strategy.cc",
       "devtools_contents_resizing_strategy.h",
       "devtools_embedder_message_dispatcher.cc",
       "devtools_embedder_message_dispatcher.h",
       "devtools_file_helper.cc",
       "devtools_file_helper.h",
       "devtools_file_system_indexer.cc",
       "devtools_file_system_indexer.h",
       "devtools_target_impl.cc",
       "devtools_target_impl.h",
       "devtools_targets_ui.cc",
       "devtools_targets_ui.h",
       "devtools_toggle_action.cc",
       "devtools_toggle_action.h",
       "devtools_ui_bindings.cc",
       "devtools_ui_bindings.h",
       "devtools_window.cc",
       "devtools_window.h",
       "remote_debugging_server.cc",
       "remote_debugging_server.h"
     ]
   }
 }