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

chrome/browser/renderer_host/web_cache_manager.cc

 // Copyright (c) 2009 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/web_cache_manager.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "base/metrics/histogram.h"
@@ skipping 214 matching lines @@
   // Compute the unreserved space available.
   size_t total_extra = global_size_limit_ - (active_size + inactive_size);
 
   // The plan for the extra space is to divide it evenly amoung the active
   // renderers.
   size_t shares = active_renderers_.size();
 
   // The inactive renderers get one share of the extra memory to be divided
   // among themselves.
   size_t inactive_extra = 0;
-  if (inactive_renderers_.size() > 0) {
+  if (!inactive_renderers_.empty()) {
     ++shares;
     inactive_extra = total_extra / shares;
   }
 
   // The remaining memory is allocated to the active renderers.
   size_t active_extra = total_extra - inactive_extra;
 
   // Actually compute the allocations for each renderer.
   AddToStrategy(active_renderers_, active_tactic, active_extra, strategy);
   AddToStrategy(inactive_renderers_, inactive_tactic, inactive_extra, strategy);
@@ skipping 155 matching lines @@
     if (idle >= TimeDelta::FromMinutes(kRendererInactiveThresholdMinutes)) {
       // Moved to inactive status.  This invalidates our iterator.
       inactive_renderers_.insert(*iter);
       active_renderers_.erase(*iter);
       iter = active_renderers_.begin();
       continue;
     }
     ++iter;
   }
 }