Use container::back() and container::pop_back().

gpu/tools/compositor_model_bench/compositor_model_bench.cc

 // Copyright (c) 2012 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.
 
 // This tool is used to benchmark the render model used by the compositor
 
 // Most of this file is derived from the source of the tile_render_bench tool,
 // and has been changed to  support running a sequence of independent
 // simulations for our different render models and test cases.
 
@@ skipping 87 matching lines @@
     sims_remaining_.push(spec);
 
     // The following lines are commented out pending the addition
     // of the new render model once this version gets fully checked in.
     //
     //  spec.model_under_test = KDTreeRenderModel;
     //  sims_remaining_.push(spec);
   }
 
   void Run() {
-    if (!sims_remaining_.size()) {
+    if (sims_remaining_.empty()) {
       LOG(WARNING) << "No configuration files loaded.";
       return;
     }
 
     base::AtExitManager at_exit;
     base::MessageLoop loop;
     if (!InitX11() || !InitGLContext()) {
       LOG(FATAL) << "Failed to set up GUI.";
     }
 
@@ skipping 195 matching lines @@
     if (sims_remaining_.size() &&
       sims_remaining_.front().simulation_start_time.is_null()) {
       while (sims_remaining_.size() && !InitializeNextTest()) {
         sims_remaining_.pop();
       }
       if (sims_remaining_.size()) {
         sims_remaining_.front().simulation_start_time = TimeTicks::Now();
       }
     }
 
-    if (!sims_remaining_.size()) {
+    if (sims_remaining_.empty()) {
       DumpOutput();
       base::MessageLoop::current()->QuitWhenIdle();
       return false;
     }
 
     return true;
   }
 
   void Resize(int width, int height) {
     window_width_ = width;
@@ skipping 58 matching lines @@
     }
   } else {
     LOG(INFO) << "(input path is a file)";
     sim.QueueTest(inPath);
   }
 
   sim.Run();
 
   return 0;
 }