Standardize usage of virtual/override/final specifiers.

gpu/command_buffer/service/memory_program_cache_unittest.cc

Index: gpu/command_buffer/service/memory_program_cache_unittest.cc
diff --git a/gpu/command_buffer/service/memory_program_cache_unittest.cc b/gpu/command_buffer/service/memory_program_cache_unittest.cc
index 4ff3fe3cd00f93465735edd673738d83d2cd0c55..d3e954e2adf7e1eb018223d914fe7fa059d423ae 100644
--- a/gpu/command_buffer/service/memory_program_cache_unittest.cc
+++ b/gpu/command_buffer/service/memory_program_cache_unittest.cc
@@ -76,9 +76,7 @@ class MemoryProgramCacheTest : public GpuServiceTest {
         vertex_shader_(NULL),
         fragment_shader_(NULL),
         shader_cache_count_(0) { }
-  virtual ~MemoryProgramCacheTest() {
-    shader_manager_.Destroy(false);
-  }
+  ~MemoryProgramCacheTest() override { shader_manager_.Destroy(false); }
 
   void ShaderCacheCb(const std::string& key, const std::string& shader) {
     shader_cache_count_++;
@@ -89,7 +87,7 @@ class MemoryProgramCacheTest : public GpuServiceTest {
   const std::string& shader_cache_shader() { return shader_cache_shader_; }
 
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     GpuServiceTest::SetUp();
 
     vertex_shader_ = shader_manager_.CreateShader(kVertexShaderClientId,