[Material][Mac] Update the incognito vector icon color to white

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

Index: chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
index e5cf6dbc9745480d6adf55213bb0ab6692048ae4..55f6315a9a3aa5d874a0b3ffb300030958ff6275 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
+++ b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
@@ -88,7 +88,7 @@ const int kDefaultIconSize = 16;
 
 // Color of the vector graphic icons when the location bar is dark.
 // SkColorSetARGB(0xCC, 0xFF, 0xFF 0xFF);
-const SkColor kMaterialDarkVectorIconColor = 0xCCFFFFFF;
+const SkColor kMaterialDarkVectorIconColor = SK_ColorWHITE;
 
 }  // namespace
 
@@ -753,6 +753,11 @@ void LocationBarViewMac::UpdateLocationIcon() {
     }
   }
 
+  // If the theme is dark, then the color should always be
+  // kMaterialDarkVectorIconColor.
+  if (in_dark_mode)
+    vector_icon_color = kMaterialDarkVectorIconColor;
+
   DCHECK(vector_icon_id != gfx::VectorIconId::VECTOR_ICON_NONE);
   NSImage* image =
       [LocationBarImageRep imageForId:vector_icon_id color:vector_icon_color];