Enable ServiceWorkerNavigationPreload by default

content/browser/service_worker/service_worker_version.h

Index: content/browser/service_worker/service_worker_version.h
diff --git a/content/browser/service_worker/service_worker_version.h b/content/browser/service_worker/service_worker_version.h
index 6325a5f30e53d049187a33a1b853bc31aac81f50..7419d1174e8343a3d5db22c7a801518a379d1f78 100644
--- a/content/browser/service_worker/service_worker_version.h
+++ b/content/browser/service_worker/service_worker_version.h
@@ -102,14 +102,6 @@ class CONTENT_EXPORT ServiceWorkerVersion
     DOES_NOT_EXIST,
   };
 
-  // Navigation Preload support status of the service worker.
-  enum class NavigationPreloadSupportStatus {
-    SUPPORTED,
-    NOT_SUPPORTED_FIELD_TRIAL_STOPPED,
-    NOT_SUPPORTED_DISABLED_BY_COMMAND_LINE,
-    NOT_SUPPORTED_NO_VALID_ORIGIN_TRIAL_TOKEN,
-  };
-
   class Listener {
    public:
     virtual void OnRunningStateChanged(ServiceWorkerVersion* version) {}
@@ -409,41 +401,6 @@ class CONTENT_EXPORT ServiceWorkerVersion
     return max_request_expiration_time_ - tick_clock_->NowTicks();
   }
 
-  // Returns the Navigation Preload support status of the service worker.
-  //  - Origin Trial: Have an effective token.
-  //                                 Command line
-  //                             Default  Enable  Disabled
-  //                   Default      A       A        B2
-  //      Field trial  Enabled      A       A        B2
-  //                   Disabled     B1      A        B2
-  //
-  //  - Origin Trial: No token.
-  //                                 Command line
-  //                             Default  Enable  Disabled
-  //                   Default      C       A        C
-  //      Field trial  Enabled      C       A        C
-  //                   Disabled     C       A        C
-  //
-  //   * A  = SUPPORTED
-  //     B1 = NOT_SUPPORTED_FIELD_TRIAL_STOPPED
-  //     B2 = NOT_SUPPORTED_DISABLED_BY_COMMAND_LINE
-  //     C  = NOT_SUPPORTED_NO_VALID_ORIGIN_TRIAL_TOKEN
-  //
-  // There are three types of behaviors:
-  //  - A: Navigation Preload related methods and attributes are available in JS
-  //       and work correctly.
-  //  - B: Navigation Preload related methods and attributes are available in
-  //       JS. But NavigationPreloadManager's enable, disable and setHeaderValue
-  //       methods always return a rejected promise. And FetchEvent's
-  //       preloadResponse attribute returns a promise which always resolve with
-  //       undefined.
-  //  - C: Navigation Preload related methods and attributes are not available
-  //       in JS.
-  // This method returns SUPPORTED only for A case.
-  // blink::OriginTrials::serviceWorkerNavigationPreloadEnabled() returns true
-  // for both A and B case. So the methods and attributes are available in JS.
-  NavigationPreloadSupportStatus GetNavigationPreloadSupportStatus() const;
-
   void CountFeature(uint32_t feature);
   void set_used_features(const std::set<uint32_t>& used_features) {
     used_features_ = used_features;