Don't check URLs against Safe Browsing if not supported.

chrome/browser/renderer_host/safe_browsing_resource_throttle.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/renderer_host/safe_browsing_resource_throttle.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prerender/prerender_contents.h"
@@ skipping 45 matching lines @@
 SafeBrowsingResourceThrottle* SafeBrowsingResourceThrottle::MaybeCreate(
     net::URLRequest* request,
     content::ResourceType resource_type,
     SafeBrowsingService* sb_service) {
 #if defined(SAFE_BROWSING_DB_LOCAL)
   // Throttle consults a local database before starting the resource request.
   return new SafeBrowsingResourceThrottle(
       request, resource_type, sb_service, DEFER_AT_START,
       SafeBrowsingService::CHECK_ALL_RESOURCE_TYPES);
 #elif defined(SAFE_BROWSING_DB_REMOTE)
-  if (!sb_service->IsAndroidFieldTrialEnabled())
+  if (!sb_service->IsAndroidFieldTrialEnabled() ||
+      !sb_service->database_manager()->IsSupported()) {
     return nullptr;
+  }
 
   // Throttle consults a remote database before processing the response.
   return new SafeBrowsingResourceThrottle(
       request, resource_type, sb_service, DONT_DEFER_AT_START,
       sb_service->GetResourceTypesToCheck());
 #else
 #error "Incompatible compile flags for safe_browsing_resource_throttle"
 #endif
 }
 
@@ skipping 244 matching lines @@
       defer_state_ = DEFERRED_REDIRECT;
       resume = false;
     }
   }
 
   if (resume) {
     defer_state_ = DEFERRED_NONE;
     controller()->Resume();
   }
 }