Remove some pointless log spewing.

sdk/lib/_internal/pub/lib/src/source/hosted.dart

Index: sdk/lib/_internal/pub/lib/src/source/hosted.dart
diff --git a/sdk/lib/_internal/pub/lib/src/source/hosted.dart b/sdk/lib/_internal/pub/lib/src/source/hosted.dart
index 798d5f1ef74dfdfdb8e0e3cd4ee2c9dbae6d0388..1429e2854603f5444ae1bf001e1befe8c48ddeb9 100644
--- a/sdk/lib/_internal/pub/lib/src/source/hosted.dart
+++ b/sdk/lib/_internal/pub/lib/src/source/hosted.dart
@@ -30,10 +30,7 @@ class HostedSource extends Source {
   /// Gets the default URL for the package server for hosted dependencies.
   static String get defaultUrl {
     var url = io.Platform.environment["PUB_HOSTED_URL"];
-    if (url != null) {
-      log.fine("Got server $url from PUB_HOSTED_URL.");
-      return url;
-    }
+    if (url != null) return url;
 
     return "https://pub.dartlang.org";
   }