Put more files under the enable_service_discovery build flag.

chrome/chrome_debugger.gypi

Index: chrome/chrome_debugger.gypi
diff --git a/chrome/chrome_debugger.gypi b/chrome/chrome_debugger.gypi
index cf38e6a8db7c9d574da190345d8f118dd5c600b4..07b02f3ab94fd00c2a34bbd05fe4620818a47a2e 100644
--- a/chrome/chrome_debugger.gypi
+++ b/chrome/chrome_debugger.gypi
@@ -65,8 +65,6 @@
             'browser/devtools/chrome_devtools_discovery_provider.h',
             'browser/devtools/device/adb/adb_client_socket.cc',
             'browser/devtools/device/adb/adb_client_socket.h',
-            'browser/devtools/device/cast_device_provider.cc',
-            'browser/devtools/device/cast_device_provider.h',
             'browser/devtools/device/adb/adb_device_provider.cc',
             'browser/devtools/device/adb/adb_device_provider.h',
             'browser/devtools/device/android_device_info_query.cc',
@@ -112,6 +110,23 @@
             'browser/devtools/remote_debugging_server.cc',
             'browser/devtools/remote_debugging_server.h',
           ],
+          'conditions': [
+            ['enable_service_discovery==1', {
+              'sources': [
+                'browser/devtools/device/cast_device_provider.cc',
+                'browser/devtools/device/cast_device_provider.h',
+                'browser/devtools/device/webrtc/devtools_bridge_client.cc',
+                'browser/devtools/device/webrtc/devtools_bridge_client.h',
+                'browser/devtools/device/webrtc/devtools_bridge_instances_request.cc',
+                'browser/devtools/device/webrtc/devtools_bridge_instances_request.h',
+                'browser/devtools/device/webrtc/send_command_request.cc',
+                'browser/devtools/device/webrtc/send_command_request.h',
+                'browser/devtools/device/webrtc/webrtc_device_provider.cc',
+                'browser/devtools/device/webrtc/webrtc_device_provider.h',
+              ],
+            }],
+          ],
+
         }], # OS!="android"
         ['debug_devtools==1', {
           'defines': [