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

gpu/tools/compositor_model_bench/compositor_model_bench.cc

Index: gpu/tools/compositor_model_bench/compositor_model_bench.cc
diff --git a/gpu/tools/compositor_model_bench/compositor_model_bench.cc b/gpu/tools/compositor_model_bench/compositor_model_bench.cc
index dca35a7b3fa3ca68b247bb04cd62c48cdfa87a0f..2cf79d0ed8ed8930594a0d5c75425c12bcf232fd 100644
--- a/gpu/tools/compositor_model_bench/compositor_model_bench.cc
+++ b/gpu/tools/compositor_model_bench/compositor_model_bench.cc
@@ -105,7 +105,7 @@ class Simulator {
   }
 
   void Run() {
-    if (!sims_remaining_.size()) {
+    if (sims_remaining_.empty()) {
       LOG(WARNING) << "No configuration files loaded.";
       return;
     }
@@ -321,7 +321,7 @@ class Simulator {
       }
     }
 
-    if (!sims_remaining_.size()) {
+    if (sims_remaining_.empty()) {
       DumpOutput();
       base::MessageLoop::current()->QuitWhenIdle();
       return false;