Update appearance of omnibox focus for MD.

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 b00d32ff7c93d814faa34c7d3d2a1791010e242e..4c6426229e8214a5edc0ab7da44d6b2110d62ab5 100644
--- a/ui/native_theme/native_theme_dark_aura.cc
+++ b/ui/native_theme/native_theme_dark_aura.cc
@@ -66,6 +66,10 @@ SkColor NativeThemeDarkAura::GetSystemColor(ColorId color_id) const {
     case kColorId_ResultsTableSelectedDimmedText:
       return kResultsTableDimmedText;
 
+    // FocusableBorder
+    case kColorId_FocusedBorderColor:
+      return gfx::kGoogleBlue300;
+
     // Intentional pass-throughs to NativeThemeAura.
     case kColorId_ButtonEnabledColor:
     case kColorId_TextOnCallToActionColor:
@@ -80,7 +84,6 @@ SkColor NativeThemeDarkAura::GetSystemColor(ColorId color_id) const {
     case kColorId_WindowBackground:
     case kColorId_DialogBackground:
     case kColorId_BubbleBackground:
-    case kColorId_FocusedBorderColor:
     case kColorId_UnfocusedBorderColor:
     case kColorId_ButtonBackgroundColor:
     case kColorId_ButtonDisabledColor: