Remove fake_wifi_service.cc from production wifi component.

components/wifi.gypi

Index: components/wifi.gypi
diff --git a/components/wifi.gypi b/components/wifi.gypi
index 9b6d4d1125194d82f4dd574ea4e4f68834521c6a..ad30b344e2af769b00352324502c99222009750f 100644
--- a/components/wifi.gypi
+++ b/components/wifi.gypi
@@ -22,7 +22,6 @@
         'wifi/wifi_export.h',
         'wifi/wifi_service.cc',
         'wifi/wifi_service.h',
-        'wifi/fake_wifi_service.cc',
         'wifi/wifi_service_mac.mm',
         'wifi/wifi_service_win.cc',
       ],
@@ -45,12 +44,27 @@
       ],
     },
     {
+      'target_name': 'wifi_test_support',
+      'type': '<(component)',
+      'dependencies': [
+        'onc_component',
+        'wifi_component',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'wifi/fake_wifi_service.cc',
+      ],
+    },
+    {
       'target_name': 'wifi_test',
       'type': 'executable',
       'dependencies': [
         '../base/base.gyp:base',
         'onc_component',
         'wifi_component',
+        'wifi_test_support',
       ],
       'include_dirs': [
         '..',