Revert of Remove all reference to carbon api

webrtc/base/proxydetect.cc

Index: webrtc/base/proxydetect.cc
diff --git a/webrtc/base/proxydetect.cc b/webrtc/base/proxydetect.cc
index 71910aa2d4dea77aff2756675afbfef1a1f36d9a..10e7a02241c3af442065ecc85a50316aebf66575 100644
--- a/webrtc/base/proxydetect.cc
+++ b/webrtc/base/proxydetect.cc
@@ -1170,6 +1170,9 @@
       result = p_putPasswordInProxyInfo(proxy);
     }
 
+    // We created the dictionary with something that had the
+    // word 'copy' in it, so we have to release it, according
+    // to the Carbon memory management standards.
     CFRelease(proxyDict);
   } else {
     LOG(LS_ERROR) << "SCDynamicStoreCopyProxies failed";
@@ -1220,6 +1223,9 @@
       result = true;
   }
 
+  // We created the dictionary with something that had the
+  // word 'copy' in it, so we have to release it, according
+  // to the Carbon memory management standards.
   CFRelease(proxy_dict);
 
   return result;