Move upgrade severity colors into NativeTheme.

ui/native_theme/native_theme_dark_aura.cc

Index: ui/native_theme/native_theme_dark_aura.cc
diff --git a/ui/native_theme/native_theme_dark_aura.cc b/ui/native_theme/native_theme_dark_aura.cc
index 1fb481465a6c9480b0f61a81c0116d4fe759dd24..635f9eca899caf6bbc9298e0c1d591295ce11599 100644
--- a/ui/native_theme/native_theme_dark_aura.cc
+++ b/ui/native_theme/native_theme_dark_aura.cc
@@ -70,6 +70,14 @@ SkColor NativeThemeDarkAura::GetSystemColor(ColorId color_id) const {
     case kColorId_FocusedBorderColor:
       return gfx::kGoogleBlue300;
 
+    // Alert icons

[tdanderson, 2016/08/17 19:44:58]

nit: .

[Evan Stade, 2016/08/17 20:18:38]

the others (above) don't do this. The comments below are actual sentences.

+    case kColorId_AlertSeverityLow:
+      return gfx::kGoogleGreen300;
+    case kColorId_AlertSeverityMedium:
+      return gfx::kGoogleYellow300;
+    case kColorId_AlertSeverityHigh:
+      return gfx::kGoogleRed300;
+
     // Intentional pass-throughs to NativeThemeAura.
     case kColorId_TextOnCallToActionColor:
     case kColorId_ResultsTableHoveredBackground: