Update from chromium https://crrev.com/301725/

gpu/command_buffer/service/renderbuffer_manager_unittest.cc

Index: gpu/command_buffer/service/renderbuffer_manager_unittest.cc
diff --git a/gpu/command_buffer/service/renderbuffer_manager_unittest.cc b/gpu/command_buffer/service/renderbuffer_manager_unittest.cc
index ba0ebea8700cd14ac6f2784d82b6ee5b5127151f..7c625e6c716d6f25a6465bb9c1f98c62f3f889dd 100644
--- a/gpu/command_buffer/service/renderbuffer_manager_unittest.cc
+++ b/gpu/command_buffer/service/renderbuffer_manager_unittest.cc
@@ -29,7 +29,7 @@ class RenderbufferManagerTestBase : public GpuServiceTest {
         memory_tracker, kMaxSize, kMaxSamples, depth24_supported));
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     manager_->Destroy(true);
     manager_.reset();
     GpuServiceTest::TearDown();
@@ -40,7 +40,7 @@ class RenderbufferManagerTestBase : public GpuServiceTest {
 
 class RenderbufferManagerTest : public RenderbufferManagerTestBase {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     bool depth24_supported = false;
     SetUpBase(NULL, depth24_supported);
   }
@@ -49,7 +49,7 @@ class RenderbufferManagerTest : public RenderbufferManagerTestBase {
 class RenderbufferManagerMemoryTrackerTest
     : public RenderbufferManagerTestBase {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     mock_memory_tracker_ = new StrictMock<MockMemoryTracker>();
     bool depth24_supported = false;
     SetUpBase(mock_memory_tracker_.get(), depth24_supported);
@@ -293,7 +293,7 @@ TEST_F(RenderbufferManagerTest, AddToSignature) {
 
 class RenderbufferManagerFormatTest : public RenderbufferManagerTestBase {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     bool depth24_supported = true;
     SetUpBase(NULL, depth24_supported);
   }