Move root_certificates.cc reference out of io_impl_sources.gypi.

runtime/bin/bin.gypi

Index: runtime/bin/bin.gypi
diff --git a/runtime/bin/bin.gypi b/runtime/bin/bin.gypi
index 3ab74a32f9df9b6d23ac8aaa8abf08e89c799ccd..3fd890ae5bd784c12861b22e86e652ee83b3b0c2 100644
--- a/runtime/bin/bin.gypi
+++ b/runtime/bin/bin.gypi
@@ -682,6 +682,10 @@
           'defines': [
             'DART_IO_SECURE_SOCKET_DISABLED'
           ],
+        }, {
+          'sources': [
+            '../../third_party/root_certificates/root_certificates.cc',
+          ],
         }],
         ['OS=="win"', {
           'sources/' : [
@@ -758,6 +762,10 @@
           'defines': [
             'DART_IO_SECURE_SOCKET_DISABLED'
           ],
+        }, {
+          'sources': [
+            '../../third_party/root_certificates/root_certificates.cc',
+          ],
         }],
         ['OS != "mac" and dart_io_support==1 and dart_io_secure_socket==1', {
           'dependencies': [
@@ -818,6 +826,10 @@
           'defines': [
             'DART_IO_SECURE_SOCKET_DISABLED',
           ],
+        }, {
+          'sources': [
+            '../../third_party/root_certificates/root_certificates.cc',
+          ],
         }],
         ['OS != "mac" and dart_io_support==1 and dart_io_secure_socket==1', {
           'dependencies': [