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

net/base/network_delegate_impl.h

Index: net/base/network_delegate_impl.h
diff --git a/net/base/network_delegate_impl.h b/net/base/network_delegate_impl.h
index d025a76847ce9dcca873dd19580b38551532b454..8acdd72a027d2410be113dabc86caec3fe3e0750 100644
--- a/net/base/network_delegate_impl.h
+++ b/net/base/network_delegate_impl.h
@@ -197,10 +197,6 @@ class NET_EXPORT NetworkDelegateImpl : public NetworkDelegate {
   // Returns true if the embedder has enabled experimental cookie features.
   bool OnAreExperimentalCookieFeaturesEnabled() const override;
 
-  // TODO(jww): Remove this once we ship strict secure cookies:
-  // https://crbug.com/546820
-  bool OnAreStrictSecureCookiesEnabled() const override;
-
   // Called when the |referrer_url| for requesting |target_url| during handling
   // of the |request| is does not comply with the referrer policy (e.g. a
   // secure referrer for an insecure initial target).