Change name of NativeTheme::instance() to make it clear it's web only.

chrome/browser/ui/cocoa/autofill/new_credit_card_bubble_cocoa.mm

Index: chrome/browser/ui/cocoa/autofill/new_credit_card_bubble_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/autofill/new_credit_card_bubble_cocoa.mm b/chrome/browser/ui/cocoa/autofill/new_credit_card_bubble_cocoa.mm
index b9d8b0c9ce5b28fe6bfd9fad9b4017a23465b5d0..6bfa92253a80c6d4d05bf84f7a1eb9b18aef57f7 100644
--- a/chrome/browser/ui/cocoa/autofill/new_credit_card_bubble_cocoa.mm
+++ b/chrome/browser/ui/cocoa/autofill/new_credit_card_bubble_cocoa.mm
@@ -20,6 +20,7 @@
 #import "ui/base/cocoa/controls/hyperlink_button_cell.h"
 #include "ui/base/cocoa/window_size_constants.h"
 #include "ui/native_theme/native_theme.h"
+#include "ui/native_theme/native_theme_mac.h"
 
 namespace {
 
@@ -85,7 +86,7 @@ const CGFloat kAnchorlessTopPadding = 10;
     controller_ = controller;
     [window setInfoBubbleCanBecomeKeyWindow:NO];
 
-    ui::NativeTheme* nativeTheme = ui::NativeTheme::instance();
+    ui::NativeTheme* nativeTheme = ui::NativeThemeMac::instance();
     [[self bubble] setBackgroundColor:
         gfx::SkColorToCalibratedNSColor(nativeTheme->GetSystemColor(
             ui::NativeTheme::kColorId_DialogBackground))];