Remove some unnecessary logs.

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

Index: sdk/lib/_internal/pub/lib/src/source/git.dart
diff --git a/sdk/lib/_internal/pub/lib/src/source/git.dart b/sdk/lib/_internal/pub/lib/src/source/git.dart
index 89653e1d28f7b3df740fdfbdb3430a6f3c792262..dc4c8b3e8a413a209474dc8b1b1431f851735885 100644
--- a/sdk/lib/_internal/pub/lib/src/source/git.dart
+++ b/sdk/lib/_internal/pub/lib/src/source/git.dart
@@ -214,9 +214,7 @@ class GitSource extends CachedSource {
   Future<String> _ensureRevision(PackageId id) {
     return new Future.sync(() {
       var path = _repoCachePath(id);
-      log.fine("ensuring $path has ${id.description}");
       if (!entryExists(path)) {
-        log.fine("$path doesn't exist");
         return _clone(_getUrl(id), path, mirror: true)
             .then((_) => _getRev(id));
       }
@@ -225,18 +223,13 @@ class GitSource extends CachedSource {
       // reference. We want to get the latest version of that reference.
       var description = id.description;
       if (description is! Map || !description.containsKey('resolved-ref')) {
-        log.fine("ID doesn't have a resolved ref");
         return _updateRepoCache(id).then((_) => _getRev(id));
       }
 
       // If [id] did come from a lockfile, then we want to avoid running "git
       // fetch" if possible to avoid networking time and errors. See if the
       // revision exists in the repo cache before updating it.
-      return _getRev(id).then((res) {
-        log.fine("ref is $res");
-        return res;
-      }).catchError((error) {
-        log.fine("repo doesn't have ref, updating");
+      return _getRev(id).catchError((error) {
         if (error is! git.GitException) throw error;
         return _updateRepoCache(id).then((_) => _getRev(id));
       });