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

sync/internal_api/test/test_user_share.cc

Index: sync/internal_api/test/test_user_share.cc
diff --git a/sync/internal_api/test/test_user_share.cc b/sync/internal_api/test/test_user_share.cc
index 136b438ceeb4808b8a0c91e55b50c6a6bba047eb..21433b185524aef0239104c5d5e600ecdec2495e 100644
--- a/sync/internal_api/test/test_user_share.cc
+++ b/sync/internal_api/test/test_user_share.cc
@@ -19,7 +19,7 @@ TestUserShare::~TestUserShare() {
 }
 
 void TestUserShare::SetUp() {
-  user_share_.reset(new syncer::UserShare());
+  user_share_.reset(new UserShare());
   dir_maker_->SetUp();
 
   // The pointer is owned by dir_maker_, we should not be storing it in a
@@ -35,7 +35,7 @@ void TestUserShare::TearDown() {
   dir_maker_->TearDown();
 }
 
-syncer::UserShare* TestUserShare::user_share() {
+UserShare* TestUserShare::user_share() {
   return user_share_.get();
 }