Show scheme in black and content in gray for data: protocol urls

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm

Index: chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
index cd2b95faefb8470578fb8128da5b00a47359f88f..c96da3aee711d82540cedb9978bfa1949d089f8a 100644
--- a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
+++ b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
@@ -571,8 +571,18 @@ void OmniboxViewMac::ApplyTextAttributes(
   AutocompleteInput::ParseForEmphasizeComponents(
       display_text, ChromeAutocompleteSchemeClassifier(profile_), &scheme,
       &host);
-  bool grey_out_url = display_text.substr(scheme.begin, scheme.len) ==
-      base::UTF8ToUTF16(extensions::kExtensionScheme);
+
+  const base::string16 url_scheme =
+      display_text.substr(scheme.begin, scheme.len);
+
+  // Is the scheme one that might be abused for spoofing purposes?
+  bool spoofy_scheme = url_scheme == base::UTF8ToUTF16(url::kDataScheme);
+
+  // Should the full URL be deemphasized?
+  bool grey_out_url =
+      (spoofy_scheme ||
+       url_scheme == base::UTF8ToUTF16(extensions::kExtensionScheme));
+
   if (model()->CurrentTextIsURL() &&
       (host.is_nonempty() || grey_out_url)) {
     [attributedString addAttribute:NSForegroundColorAttributeName
@@ -583,6 +593,10 @@ void OmniboxViewMac::ApplyTextAttributes(
       [attributedString addAttribute:NSForegroundColorAttributeName
                                value:HostTextColor(in_dark_mode)
                                range:ComponentToNSRange(host)];
+    } else if (spoofy_scheme) {
+      [attributedString addAttribute:NSForegroundColorAttributeName
+                               value:HostTextColor(in_dark_mode)
+                               range:ComponentToNSRange(scheme)];
     }
   }