Remove unused references to NativeTheme in TrayPopupItemStyle.

ash/common/system/chromeos/network/vpn_list_view.cc

Index: ash/common/system/chromeos/network/vpn_list_view.cc
diff --git a/ash/common/system/chromeos/network/vpn_list_view.cc b/ash/common/system/chromeos/network/vpn_list_view.cc
index d817f9972deb46abc00eab06a7620565411065b0..f4a21d2e5d82a5625115507959c898a1947018b0 100644
--- a/ash/common/system/chromeos/network/vpn_list_view.cc
+++ b/ash/common/system/chromeos/network/vpn_list_view.cc
@@ -124,12 +124,14 @@ class VPNListProviderEntryMd : public views::ButtonListener,
     label->SetText(base::ASCIIToUTF16(name));
     tri_view->AddView(TriView::Container::CENTER, label);
 
-    gfx::ImageSkia icon = gfx::CreateVectorIcon(kSystemMenuAddConnectionIcon,
-                                                style.GetIconColor());
+    const SkColor image_color = GetNativeTheme()->GetSystemColor(

[bruthig, 2017/02/01 22:50:08]

I didn't think the correct NativeTheme was available prior to the View being
added to a Widget?

Also, if we are pulling the color from a theme then shouldn't we be re-applying
the color in OnNativeThemeChanged() events?

[Evan Stade, 2017/02/01 23:17:46]

sort of. We're not guaranteed the correct native theme but on cros there's only
one theme, so we sort of are. If we changed that (for example if we decided the
system menu ought to be light-on-dark and therefore use a dark aura theme) this
would need to be revisited.

[bruthig, 2017/02/01 23:31:01]

Gotcha, thx!

+        ui::NativeTheme::kColorId_ProminentButtonColor);
+    gfx::ImageSkia icon =
+        gfx::CreateVectorIcon(kSystemMenuAddConnectionIcon, image_color);
     SystemMenuButton* add_vpn_button =
         new SystemMenuButton(this, TrayPopupInkDropStyle::HOST_CENTERED, icon,
                              icon, button_accessible_name_id);
-    add_vpn_button->SetInkDropColor(style.GetIconColor());
+    add_vpn_button->SetInkDropColor(image_color);
     add_vpn_button->SetEnabled(true);
     tri_view->AddView(TriView::Container::END, add_vpn_button);
   }