Update {virtual,override} to follow C++11 style in printing.

printing/emf_win_unittest.cc

Index: printing/emf_win_unittest.cc
diff --git a/printing/emf_win_unittest.cc b/printing/emf_win_unittest.cc
index 247da12434913c8e841080706fd83e9638454dbd..0f2058675ea1eb184d2bab049493139cf91c9098 100644
--- a/printing/emf_win_unittest.cc
+++ b/printing/emf_win_unittest.cc
@@ -41,8 +41,8 @@ class EmfPrintingTest : public testing::Test, public PrintingContext::Delegate {
   }
 
   // PrintingContext::Delegate methods.
-  virtual gfx::NativeView GetParentView() override { return NULL; }
-  virtual std::string GetAppLocale() override { return std::string(); }
+  gfx::NativeView GetParentView() override { return NULL; }
+  std::string GetAppLocale() override { return std::string(); }
 };
 
 const uint32 EMF_HEADER_SIZE = 128;