[EasyUnlock] Update BluetoothLowEnergyConnectionFinder to look for EIDs.

components/cryptauth/background_eid_generator.cc

 // Copyright 2016 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/cryptauth/background_eid_generator.h"
 
 #include <cstring>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
 #include "base/time/default_clock.h"
 #include "base/time/time.h"
 #include "components/cryptauth/proto/cryptauth_api.pb.h"
 #include "components/cryptauth/raw_eid_generator.h"
 #include "components/cryptauth/raw_eid_generator_impl.h"
 #include "components/proximity_auth/logging/logging.h"
 
 namespace cryptauth {
 
 namespace {
 
 // The duration of a EID period in milliseconds.
-const int64_t kEidPeriodMs = base::TimeDelta::FromMinutes(15).InMilliseconds();
+const int64_t kEidPeriodMs = 15 * 60 * 1000;  // 15 minutes
 
 // The number of periods to look forward and backwards when calculating the
 // neartest EIDs.
 const int kEidLookAhead = 2;
 
 // Returns the BeaconSeed valid for |timestamp_ms|, or nullptr if none can be
 // found.
 const BeaconSeed* GetBeaconSeedForTimestamp(
     int64_t timestamp_ms,
     const std::vector<BeaconSeed>& beacon_seeds) {
@@ skipping 52 matching lines @@
       seed_start_time_ms + (offset_time_ms / kEidPeriodMs) * kEidPeriodMs;
 
   std::string eid = raw_eid_generator_->GenerateEid(
       beacon_seed->data(), start_of_period_ms, nullptr);
 
   PA_LOG(INFO) << "  " << start_of_period_ms << ": " << eid;
   return base::MakeUnique<std::string>(eid);
 }
 
 }  // cryptauth