MacViews: Use the Aura color for prominent button backgrounds.

ui/native_theme/native_theme_mac.mm

 // Copyright (c) 2013 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 "ui/native_theme/native_theme_mac.h"
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #include "base/mac/mac_util.h"
@@ skipping 163 matching lines @@
       return SK_ColorWHITE;
 
     case kColorId_FocusedBorderColor:
       return NSSystemColorToSkColor([NSColor keyboardFocusIndicatorColor]);
     case kColorId_UnfocusedBorderColor:
       return NSSystemColorToSkColor([NSColor controlColor]);
 
     // Buttons and labels.
     case kColorId_ButtonEnabledColor:
     case kColorId_LabelEnabledColor:
+      return NSSystemColorToSkColor([NSColor controlTextColor]);
+    // NSColor doesn't offer a color for prominent buttons. Use the Aura color,
+    // but apply the system tint. This is a good match for the blue Cocoa uses
+    // to draw buttons that are given a \n key equivalent.
     case kColorId_ProminentButtonColor:
-      return NSSystemColorToSkColor([NSColor controlTextColor]);
+      return ApplySystemControlTint(GetAuraColor(color_id, this));
     case kColorId_ButtonDisabledColor:
     case kColorId_LabelDisabledColor:
       return NSSystemColorToSkColor([NSColor disabledControlTextColor]);
     case kColorId_ButtonHoverColor:
       return NSSystemColorToSkColor([NSColor selectedControlTextColor]);
     case kColorId_LabelTextSelectionColor:
       return NSSystemColorToSkColor([NSColor selectedTextColor]);
 
     // Link.
     case kColorId_LinkDisabled:
@@ skipping 83 matching lines @@
   }
 }
 
 NativeThemeMac::NativeThemeMac() {
 }
 
 NativeThemeMac::~NativeThemeMac() {
 }
 
 }  // namespace ui