Remove EnableReducedReferrerGranularity from WebRuntimeFeatures

This patch removes EnableReducedReferrerGranularity from WebRuntimeFeatures,
because features::kReducedReferrerGranularity is available in Blink now.

Bug: 860403
Change-Id: If7da017b49bf86c2a539e07ac03a0735658f6a81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358992
Commit-Queue: Minggang Wang <minggang.wang@intel.com>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801696}

content/child/runtime_features.cc

@@ -618,15 +618,6 @@ void SetCustomizedRuntimeFeaturesFromCombinedArgs(
   WebRuntimeFeatures::EnableBackForwardCache(
       content::IsBackForwardCacheEnabled());
 
-  // Gate the ReducedReferrerGranularity runtime feature depending on whether
-  // content is configured to force a no-referrer-when-downgrade default policy.
-  // TODO(crbug.com/1016541): After M82, remove when the corresponding
-  // enterprise policy has been deleted.
-  WebRuntimeFeatures::EnableReducedReferrerGranularity(
-      base::FeatureList::IsEnabled(
-          blink::features::kReducedReferrerGranularity) &&
-      !blink::ReferrerUtils::ShouldForceLegacyDefaultReferrerPolicy());
-
   if (base::FeatureList::IsEnabled(
           blink::features::kAppCacheRequireOriginTrial)) {
     // The kAppCacheRequireOriginTrial is a flag that controls whether or not

third_party/blink/public/platform/web_runtime_features.h

@@ -154,7 +154,6 @@ class WebRuntimeFeatures {
   BLINK_PLATFORM_EXPORT static void EnablePresentationAPI(bool);
   BLINK_PLATFORM_EXPORT static void EnablePushMessaging(bool);
   BLINK_PLATFORM_EXPORT static void EnablePushSubscriptionChangeEvent(bool);
-  BLINK_PLATFORM_EXPORT static void EnableReducedReferrerGranularity(bool);
   BLINK_PLATFORM_EXPORT static void EnableRemotePlaybackAPI(bool);
   BLINK_PLATFORM_EXPORT static void
   EnableRestrictAutomaticLazyFrameLoadingToDataSaver(bool);

third_party/blink/renderer/platform/exported/web_runtime_features.cc

@@ -435,10 +435,6 @@ void WebRuntimeFeatures::EnableV8IdleTasks(bool enable) {
   RuntimeEnabledFeatures::SetV8IdleTasksEnabled(enable);
 }
 
-void WebRuntimeFeatures::EnableReducedReferrerGranularity(bool enable) {
-  RuntimeEnabledFeatures::SetReducedReferrerGranularityEnabled(enable);
-}
-
 void WebRuntimeFeatures::EnablePushMessaging(bool enable) {
   RuntimeEnabledFeatures::SetPushMessagingEnabled(enable);
 }

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -1559,10 +1559,6 @@
       // Enabled when blink::features::kRawClipboard is enabled.
       name: "RawClipboard",
     },
-    {
-      name: "ReducedReferrerGranularity",
-      status: "experimental",
-    },
     {
       name: "RemotePlayback",
       status: "stable",