Switch Safe Browsing's metadata from string to struct.

components/safe_browsing_db/util.cc

 // Copyright (c) 2015 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 "components/safe_browsing_db/util.h"
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/strings/string_util.h"
@@ skipping 11 matching lines @@
 bool IsKnownList(const std::string& name) {
   for (size_t i = 0; i < arraysize(kAllLists); ++i) {
     if (!strcmp(kAllLists[i], name.c_str())) {
       return true;
     }
   }
   return false;
 }
 }  // namespace
 
+// ThreatMetadata ------------------------------------------------------------
+ThreatMetadata::ThreatMetadata()
+    : threat_pattern_type(ThreatPatternType::NONE) {}
+
+ThreatMetadata::~ThreatMetadata() {}
+
 // SBCachedFullHashResult ------------------------------------------------------
 
 SBCachedFullHashResult::SBCachedFullHashResult() {}
 
 SBCachedFullHashResult::SBCachedFullHashResult(
     const base::Time& in_expire_after)
     : expire_after(in_expire_after) {}
 
 SBCachedFullHashResult::SBCachedFullHashResult(
     const SBCachedFullHashResult& other) = default;
@@ skipping 372 matching lines @@
   GenerateHostsToCheck(url, &hosts);
   GeneratePathsToCheck(url, &paths);
   for (size_t h = 0; h < hosts.size(); ++h) {
     for (size_t p = 0; p < paths.size(); ++p) {
       urls->push_back(hosts[h] + paths[p]);
     }
   }
 }
 
 }  // namespace safe_browsing