Delete unused member variable.

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 0196d9b214c7eb9858f0e1caae5b31d82e20955a..031430ad6b2aad429b65a3ad0050159a122762e5 100644
--- a/gpu/tools/compositor_model_bench/compositor_model_bench.cc
+++ b/gpu/tools/compositor_model_bench/compositor_model_bench.cc
@@ -61,8 +61,7 @@ void _update_loop(Simulator* sim);
 class Simulator {
  public:
   Simulator(int seconds_per_test, const FilePath& output_path)
-     : running_(false),
-       current_sim_(NULL),
+     : current_sim_(NULL),
        output_path_(output_path),
        seconds_per_test_(seconds_per_test),
        ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)),
@@ -341,7 +340,6 @@ class Simulator {
   }
 
   // Simulation task list for this execution
-  bool running_;
   RenderModelSimulator* current_sim_;
   queue<SimulationSpecification> sims_remaining_;
   queue<SimulationSpecification> sims_completed_;