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

printing/printing_context_win_unittest.cc

Index: printing/printing_context_win_unittest.cc
diff --git a/printing/printing_context_win_unittest.cc b/printing/printing_context_win_unittest.cc
index a758ca616546b88653c7b66a39660d181d213605..a9f1dc5cbc48e082e6fdd66150b1009e6a9d1e85 100644
--- a/printing/printing_context_win_unittest.cc
+++ b/printing/printing_context_win_unittest.cc
@@ -24,8 +24,8 @@ class PrintingContextTest : public PrintingTest<testing::Test>,
   }
 
   // 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(); }
 
  protected:
   PrintingContext::Result result() const { return result_; }