Gtk3: Fix link color in 3.12 and later

chrome/browser/ui/libgtkui/native_theme_gtk3.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/libgtkui/native_theme_gtk3.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtkui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtkui/chrome_gtk_menu_subclasses.h"
@@ skipping 103 matching lines @@
     case ui::NativeTheme::kColorId_LabelTextSelectionColor:
       return GetFgColor("GtkLabel#label #selection:selected");
     case ui::NativeTheme::kColorId_LabelTextSelectionBackgroundFocused:
       return GetBgColor("GtkLabel#label #selection:selected");
 
     // Link
     case ui::NativeTheme::kColorId_LinkDisabled:
       return SkColorSetA(
           SkColorFromColorId(ui::NativeTheme::kColorId_LinkEnabled), 0xBB);
     case ui::NativeTheme::kColorId_LinkPressed:
+      if (GtkVersionCheck(3, 12))
+        return GetFgColor("GtkLabel#label.link:link:hover:active");
+      // fallthrough
     case ui::NativeTheme::kColorId_LinkEnabled: {
-      // TODO(thomasanderson): Gtk changed the way links are colored in 3.12.
-      // Add code for later versions.
+      if (GtkVersionCheck(3, 12)) {
+        return GetFgColor("GtkLabel#label.link:link");
+      }
       auto link_context = GetStyleContextFromCss("GtkLabel#label.view");
       GdkColor* color;
       gtk_style_context_get_style(link_context, "link-color", &color, nullptr);
       if (color) {
         SkColor ret_color = SkColorSetRGB(color->red / 255, color->green / 255,
                                           color->blue / 255);
+        // gdk_color_free() was deprecated in Gtk3.14.  This code path is only
+        // taken on versions earlier than Gtk3.12, but the compiler doesn't know
+        // that, so silence the deprecation warnings.
+        G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
         gdk_color_free(color);
+        G_GNUC_END_IGNORE_DEPRECATIONS;
         return ret_color;
-      } else {
-        // Default color comes from gtklinkbutton.c.
-        return SkColorSetRGB(0x00, 0x00, 0xEE);
       }
+
+      // Default color comes from gtklinkbutton.c.
+      return SkColorSetRGB(0x00, 0x00, 0xEE);
     }
 
     // Separator
     case ui::NativeTheme::kColorId_SeparatorColor:
       if (GtkVersionCheck(3, 20))
         return GetBgColor("GtkSeparator#separator.horizontal");
       else
         return GetFgColor("GtkSeparator#separator.horizontal");
 
     // Button
@@ skipping 206 matching lines @@
 void NativeThemeGtk3::PaintMenuItemBackground(
     SkCanvas* canvas,
     State state,
     const gfx::Rect& rect,
     const MenuItemExtraParams& menu_item) const {
   PaintWidget(canvas, rect, "GtkMenu#menu GtkMenuItem#menuitem",
               StateToStateFlags(state));
 }
 
 }  // namespace libgtkui