Apply View::set_preferred_size in some more places.

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 49c382b7d5d7ad11319dc3f92d62625e971aaad0..a86e9621b3fc4ea6ecf06e5f8f401a40a7dacac0 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -88,26 +88,15 @@ class PaddingTrayItem : public SystemTrayItem {
 
   // SystemTrayItem:
   views::View* CreateTrayView(LoginStatus status) override {
-    return new PaddingView();
+    auto* padding = new views::View();
+    // The other tray items already have some padding baked in so we have to
+    // subtract that off.
+    constexpr int side = kTrayEdgePadding - kTrayImageItemPadding;
+    padding->set_preferred_size(gfx::Size(side, side));
+    return padding;
   }
 
  private:
-  class PaddingView : public views::View {
-   public:
-    PaddingView() {}
-    ~PaddingView() override {}
-
-   private:
-    gfx::Size GetPreferredSize() const override {
-      // The other tray items already have some padding baked in so we have to
-      // subtract that off.
-      const int side = kTrayEdgePadding - kTrayImageItemPadding;
-      return gfx::Size(side, side);
-    }
-
-    DISALLOW_COPY_AND_ASSIGN(PaddingView);
-  };
-
   DISALLOW_COPY_AND_ASSIGN(PaddingTrayItem);
 };