Change other usages of .size() to .empty() when applicable.

net/url_request/url_request_throttler_entry.cc

 // Copyright (c) 2010 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 "net/url_request/url_request_throttler_entry.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 #include "base/rand_util.h"
@@ skipping 56 matching lines @@
 
 bool URLRequestThrottlerEntry::IsEntryOutdated() const {
   CHECK(this);  // to help track crbug.com/71721
   if (entry_lifetime_ms_ == -1)
     return false;
 
   base::TimeTicks now = GetTimeNow();
 
   // If there are send events in the sliding window period, we still need this
   // entry.
-  if (send_log_.size() > 0 &&
+  if (!send_log_.empty() &&
       send_log_.back() + sliding_window_period_ > now) {
     return false;
   }
 
   int64 unused_since_ms =
       (now - exponential_backoff_release_time_).InMilliseconds();
 
   // Release time is further than now, we are managing it.
   if (unused_since_ms < 0)
     return false;
@@ skipping 150 matching lines @@
 
   if (maximum_backoff_ms_ < value_ms || value_ms < 0)
     return;
 
   exponential_backoff_release_time_ = std::max(
       (GetTimeNow() + base::TimeDelta::FromMilliseconds(value_ms)),
       exponential_backoff_release_time_);
 }
 
 }  // namespace net