[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

sync/internal_api/public/test/test_user_share.h

Index: sync/internal_api/public/test/test_user_share.h
diff --git a/sync/internal_api/public/test/test_user_share.h b/sync/internal_api/public/test/test_user_share.h
index 7ce6ff8bf8206e1a5519881298d75da862af1548..ea811a1750b657d17e7724990da6fc07ba10d1c5 100644
--- a/sync/internal_api/public/test/test_user_share.h
+++ b/sync/internal_api/public/test/test_user_share.h
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 //
 // A handy class that takes care of setting up and destroying a
-// syncer::UserShare instance for unit tests that require one.
+// UserShare instance for unit tests that require one.
 //
 // The expected usage is to make this a component of your test fixture:
 //
@@ -22,7 +22,7 @@
 // Then, in your tests:
 //
 //   TEST_F(AwesomenessTest, IsMaximal) {
-//     syncer::ReadTransaction trans(test_user_share_.user_share());
+//     ReadTransaction trans(test_user_share_.user_share());
 //     ...
 //   }
 //
@@ -53,11 +53,11 @@ class TestUserShare {
   void TearDown();
 
   // Non-NULL iff called between a call to SetUp() and TearDown().
-  syncer::UserShare* user_share();
+  UserShare* user_share();
 
  private:
   scoped_ptr<TestDirectorySetterUpper> dir_maker_;
-  scoped_ptr<syncer::UserShare> user_share_;
+  scoped_ptr<UserShare> user_share_;
 
   DISALLOW_COPY_AND_ASSIGN(TestUserShare);
 };