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

chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.cc

Index: chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.cc
diff --git a/chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.cc b/chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.cc
index a2802990a93098d8a1fc4e876b0866e830eba055..ea2d19d6fe7ab8f06155bcb00fd77c658dc9834d 100644
--- a/chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.cc
+++ b/chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.cc
@@ -41,27 +41,27 @@ class DesktopThemeProvider : public ui::ThemeProvider {
       : delegate_(delegate) {
   }
 
-  virtual bool UsingSystemTheme() const override {
+  bool UsingSystemTheme() const override {
     return delegate_->UsingSystemTheme();
   }
-  virtual gfx::ImageSkia* GetImageSkiaNamed(int id) const override {
+  gfx::ImageSkia* GetImageSkiaNamed(int id) const override {
     return delegate_->GetImageSkiaNamed(
         chrome::MapThemeImage(chrome::HOST_DESKTOP_TYPE_NATIVE, id));
   }
-  virtual SkColor GetColor(int id) const override {
+  SkColor GetColor(int id) const override {
     return delegate_->GetColor(id);
   }
-  virtual int GetDisplayProperty(int id) const override {
+  int GetDisplayProperty(int id) const override {
     return delegate_->GetDisplayProperty(id);
   }
-  virtual bool ShouldUseNativeFrame() const override {
+  bool ShouldUseNativeFrame() const override {
     return delegate_->ShouldUseNativeFrame();
   }
-  virtual bool HasCustomImage(int id) const override {
+  bool HasCustomImage(int id) const override {
     return delegate_->HasCustomImage(
         chrome::MapThemeImage(chrome::HOST_DESKTOP_TYPE_NATIVE, id));
   }
-  virtual base::RefCountedMemory* GetRawData(
+  base::RefCountedMemory* GetRawData(
       int id,
       ui::ScaleFactor scale_factor) const override {
     return delegate_->GetRawData(id, scale_factor);