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

chrome/renderer/spellchecker/spellcheck_provider.h

Index: chrome/renderer/spellchecker/spellcheck_provider.h
diff --git a/chrome/renderer/spellchecker/spellcheck_provider.h b/chrome/renderer/spellchecker/spellcheck_provider.h
index 4efe504990187118c9336612248350f63991d55c..793b39187dbe1b1354dffee0470bd6d413e07aa2 100644
--- a/chrome/renderer/spellchecker/spellcheck_provider.h
+++ b/chrome/renderer/spellchecker/spellcheck_provider.h
@@ -68,27 +68,27 @@ class SpellCheckProvider
                                blink::WebTextCheckingCompletion* completion);
 
   // blink::WebSpellCheckClient implementation.
-  virtual void spellCheck(
+  void spellCheck(
       const blink::WebString& text,
       int& offset,
       int& length,
       blink::WebVector<blink::WebString>* optional_suggestions) override;
-  virtual void checkTextOfParagraph(
+  void checkTextOfParagraph(
       const blink::WebString& text,
       blink::WebTextCheckingTypeMask mask,
       blink::WebVector<blink::WebTextCheckingResult>* results) override;
 
-  virtual void requestCheckingOfText(
+  void requestCheckingOfText(
       const blink::WebString& text,
       const blink::WebVector<uint32>& markers,
       const blink::WebVector<unsigned>& marker_offsets,
       blink::WebTextCheckingCompletion* completion) override;
 
-  virtual blink::WebString autoCorrectWord(
+  blink::WebString autoCorrectWord(
       const blink::WebString& misspelled_word) override;
-  virtual void showSpellingUI(bool show) override;
-  virtual bool isShowingSpellingUI() override;
-  virtual void updateSpellingUIWithMisspelledWord(
+  void showSpellingUI(bool show) override;
+  bool isShowingSpellingUI() override;
+  void updateSpellingUIWithMisspelledWord(
       const blink::WebString& word) override;
 
 #if !defined(OS_MACOSX)