[BackgroundSync] Change the default number of sync attempts to 3

content/public/browser/background_sync_parameters.cc

 // Copyright 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 "content/public/browser/background_sync_parameters.h"
 
 namespace content {
 
 namespace {
-const int kMaxSyncAttempts = 5;
+const int kMaxSyncAttempts = 3;
 const int kInitialRetryDelayMins = 5;
 const int kRetryDelayFactor = 3;
 const int64_t kMinSyncRecoveryTimeMs = 1000 * 60 * 6;  // 6 minutes
 }
 
 BackgroundSyncParameters::BackgroundSyncParameters()
     : disable(false),
       max_sync_attempts(kMaxSyncAttempts),
       initial_retry_delay(base::TimeDelta::FromMinutes(kInitialRetryDelayMins)),
       retry_delay_factor(kRetryDelayFactor),
       min_sync_recovery_time(
           base::TimeDelta::FromMilliseconds(kMinSyncRecoveryTimeMs)) {}
 
 bool BackgroundSyncParameters::operator==(
     const BackgroundSyncParameters& other) const {
   return disable == other.disable &&
          max_sync_attempts == other.max_sync_attempts &&
          initial_retry_delay == other.initial_retry_delay &&
          retry_delay_factor == other.retry_delay_factor &&
          min_sync_recovery_time == other.min_sync_recovery_time;
 }
 
 }  // namespace content