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

gpu/command_buffer/tests/gl_lose_context_chromium_unittest.cc

Index: gpu/command_buffer/tests/gl_lose_context_chromium_unittest.cc
diff --git a/gpu/command_buffer/tests/gl_lose_context_chromium_unittest.cc b/gpu/command_buffer/tests/gl_lose_context_chromium_unittest.cc
index 547c1ed763cbea925de91c67744110a8b7bc9300..94381ac31ad7be8585e1320c79622f0236bdc6f5 100644
--- a/gpu/command_buffer/tests/gl_lose_context_chromium_unittest.cc
+++ b/gpu/command_buffer/tests/gl_lose_context_chromium_unittest.cc
@@ -17,7 +17,7 @@ namespace gpu {
 
 class GLLoseContextTest : public testing::Test {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     GLManager::Options options;
     gl2_.Initialize(options);
     options.context_lost_allowed = true;
@@ -26,7 +26,7 @@ class GLLoseContextTest : public testing::Test {
     gl1b_.Initialize(options);
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     gl1a_.Destroy();
     gl1b_.Destroy();
     gl2_.Destroy();