Implements strict secure cookies as the default behavior in //net

net/cookies/cookie_options.h

Index: net/cookies/cookie_options.h
diff --git a/net/cookies/cookie_options.h b/net/cookies/cookie_options.h
index d1c6afc63711f445632a0b01df47f049e9f510b8..53a4d0f0c0e2a560caf863ae40a77bea1996d24a 100644
--- a/net/cookies/cookie_options.h
+++ b/net/cookies/cookie_options.h
@@ -50,11 +50,6 @@ class NET_EXPORT CookieOptions {
     return same_site_cookie_mode_;
   }
 
-  // TODO(jww): Remove once we decide whether to ship modifying 'secure' cookies
-  // only from secure schemes. https://crbug.com/546820
-  void set_enforce_strict_secure() { enforce_strict_secure_ = true; }
-  bool enforce_strict_secure() const { return enforce_strict_secure_; }
-
   // |server_time| indicates what the server sending us the Cookie thought the
   // current time was when the cookie was produced.  This is used to adjust for
   // clock skew between server and host.
@@ -70,7 +65,6 @@ class NET_EXPORT CookieOptions {
  private:
   bool exclude_httponly_;
   SameSiteCookieMode same_site_cookie_mode_;
-  bool enforce_strict_secure_;
   bool update_access_time_;
   base::Time server_time_;
 };