[DevTools] Cleanup DevToolsTarget and DevToolsManagerDelegate after moving to devtools_discovery.

chrome/browser/devtools/BUILD.gn

Index: chrome/browser/devtools/BUILD.gn
diff --git a/chrome/browser/devtools/BUILD.gn b/chrome/browser/devtools/BUILD.gn
index 9dc9e9fef7ea4095ecc6c9f7f65cfcbef443991c..599f71e16bd1ce8547fd327d97ca73c079cffb34 100644
--- a/chrome/browser/devtools/BUILD.gn
+++ b/chrome/browser/devtools/BUILD.gn
@@ -30,6 +30,8 @@ action("devtools_protocol_constants") {
 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",
@@ -79,8 +81,6 @@ static_library("devtools") {
     sources += [
       "chrome_devtools_discovery_provider.cc",
       "chrome_devtools_discovery_provider.h",
-      "chrome_devtools_manager_delegate.cc",
-      "chrome_devtools_manager_delegate.h",
       "device/adb/adb_client_socket.cc",
       "device/adb/adb_client_socket.h",
       "device/adb/adb_device_provider.cc",