Make spacing between uber tray items consistent with UI spec.

ash/system/user/tray_user.cc

Index: ash/system/user/tray_user.cc
diff --git a/ash/system/user/tray_user.cc b/ash/system/user/tray_user.cc
index 4e81ed4548946f91752b76a5192c18eaa8d7f982..325d5e7a666339fff07772f0a416afb1f1ef8618 100644
--- a/ash/system/user/tray_user.cc
+++ b/ash/system/user/tray_user.cc
@@ -32,8 +32,6 @@
 namespace {
 
 const int kUserInfoVerticalPadding = 10;
-const int kUserInfoEmptyBorderLeftPadding = 6;
-const int kUserInfoEmptyBorderRightPadding = 1;
 const int kUserIconSize = 27;
 
 }  // namespace
@@ -257,8 +255,6 @@ TrayUser::~TrayUser() {
 views::View* TrayUser::CreateTrayView(user::LoginStatus status) {
   CHECK(avatar_ == NULL);
   avatar_ = new tray::RoundedImageView(kTrayRoundedBorderRadius);
-  avatar_->set_border(views::Border::CreateEmptyBorder(
-      0, kUserInfoEmptyBorderLeftPadding, 0, kUserInfoEmptyBorderRightPadding));
   UpdateAfterLoginStatusChange(status);
   return avatar_;
 }
@@ -299,6 +295,10 @@ void TrayUser::UpdateAfterLoginStatusChange(user::LoginStatus status) {
   }
 }
 
+void TrayUser::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
+  SetTrayImageItemBorder(avatar_, alignment);
+}
+
 void TrayUser::OnUserUpdate() {
   avatar_->SetImage(
       ash::Shell::GetInstance()->tray_delegate()->GetUserImage(),