Delete unused net feature.

This feature is superseded by
network::features::kBlockNonSecureExternalRequests.

Bug: 986744
Change-Id: I38c5cb79835d4e677cf5fe8abf442a7c071340cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264712
Commit-Queue: Titouan Rigoudy <titouan@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Auto-Submit: Titouan Rigoudy <titouan@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781959}

net/base/features.cc

@@ -147,10 +147,6 @@ const base::FeatureParam<int>
         &kRecentCreationTimeGrantsLegacyCookieSemantics,
         "RecentCreationTimeGrantsLegacyCookieSemanticsMilliseconds", 0};
 
-const base::Feature kBlockExternalRequestsFromNonSecureInitiators{
-    "BlockExternalRequestsFromNonSecureInitiators",
-    base::FEATURE_DISABLED_BY_DEFAULT};
-
 #if BUILDFLAG(BUILTIN_CERT_VERIFIER_FEATURE_SUPPORTED)
 const base::Feature kCertVerifierBuiltinFeature{
     "CertVerifierBuiltin", base::FEATURE_DISABLED_BY_DEFAULT};

net/base/features.h

@@ -195,12 +195,6 @@ NET_EXPORT extern const base::Feature
 NET_EXPORT extern const base::FeatureParam<int>
     kRecentCreationTimeGrantsLegacyCookieSemanticsMilliseconds;
 
-// When enabled, blocks external requests coming from non-secure contexts. An
-// external request is a request that crosses a network boundary from a more
-// public address space into a less public address space.
-NET_EXPORT extern const base::Feature
-    kBlockExternalRequestsFromNonSecureInitiators;
-
 #if BUILDFLAG(BUILTIN_CERT_VERIFIER_FEATURE_SUPPORTED)
 // When enabled, use the builtin cert verifier instead of the platform verifier.
 NET_EXPORT extern const base::Feature kCertVerifierBuiltinFeature;