Missing explicit keyword in ctor of FooImpl.h

Source/web/SpellCheckerClientImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 namespace blink {
 class LocalFrame;
 class HTMLInputElement;
 }
 
 namespace blink {
 class WebViewImpl;
 
 class SpellCheckerClientImpl FINAL : public blink::SpellCheckerClient, public blink::TextCheckerClient {
 public:
-    SpellCheckerClientImpl(WebViewImpl*);
+    explicit SpellCheckerClientImpl(WebViewImpl*);
 
     virtual ~SpellCheckerClientImpl();
 
     virtual bool isContinuousSpellCheckingEnabled() OVERRIDE;
     virtual void toggleContinuousSpellChecking() OVERRIDE;
     virtual bool isGrammarCheckingEnabled() OVERRIDE;
     virtual bool shouldEraseMarkersAfterChangeSelection(blink::TextCheckingType) const OVERRIDE;
     virtual void checkSpellingOfString(const String&, int* misspellingLocation, int* misspellingLength) OVERRIDE;
     virtual void checkGrammarOfString(const String&, WTF::Vector<blink::GrammarDetail>&,
         int* badGrammarLocation, int* badGrammarLength) OVERRIDE;
@@ skipping 22 matching lines @@
     enum {
         SpellCheckAutomatic,
         SpellCheckForcedOn,
         SpellCheckForcedOff
     } m_spellCheckThisFieldStatus;
 };
 
 } // namespace blink
 
 #endif