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

chrome/browser/ui/sync/profile_signin_confirmation_helper.h

Index: chrome/browser/ui/sync/profile_signin_confirmation_helper.h
diff --git a/chrome/browser/ui/sync/profile_signin_confirmation_helper.h b/chrome/browser/ui/sync/profile_signin_confirmation_helper.h
index 949bcd2e134680fa029e6b51e05f90e3ef4f2766..9d2e200ac819d2e07e50f0933e47171004ca4ea3 100644
--- a/chrome/browser/ui/sync/profile_signin_confirmation_helper.h
+++ b/chrome/browser/ui/sync/profile_signin_confirmation_helper.h
@@ -12,12 +12,14 @@ class Profile;
 
 namespace ui {
 
+class NativeTheme;
+
 // Blend parameters for the dialog prompt bar.
 const SkAlpha kSigninConfirmationPromptBarBackgroundAlpha = 0x0A;
 const SkAlpha kSigninConfirmationPromptBarBorderAlpha = 0x1F;
 
 // Create slightly different colors for the dialog prompt bar.
-SkColor GetSigninConfirmationPromptBarColor(SkAlpha alpha);
+SkColor GetSigninConfirmationPromptBarColor(NativeTheme* theme, SkAlpha alpha);
 
 // Determines whether the browser has ever been shutdown since the
 // profile was created.