Move screenlock_bridge to components/proximity_auth

components/signin.gypi

Index: components/signin.gypi
diff --git a/components/signin.gypi b/components/signin.gypi
index 2bad40257d8952d7838b226e3ce20c63a4fe47d6..8857046f6dd0be2832113e2735d5a5aeb5d1db31 100644
--- a/components/signin.gypi
+++ b/components/signin.gypi
@@ -147,5 +147,31 @@
         },
       ],
     }],
+    ['OS != "ios"', {
+      'targets': [
+        {
+          # GN version: //components/signin/content:content
+          'target_name': 'signin_content',
+          'type': '<(component)',
+          'sources': [
+            'signin/content/screenlock_bridge.cc',
+            'signin/content/screenlock_bridge.h',
+          ],
+          'dependencies' : [
+            '../base/base.gyp:base',
+          ],
+          'include_dirs': [
+            '..',
+          ],
+          'conditions': [
+            ['chromeos==1', {
+              'dependencies': [
+                '../chromeos/chromeos.gyp:chromeos',
+              ],
+            }],
+          ],
+        }
+      ],
+    }],
   ],
 }