Cleanup namespace usage in public/web/Web[N-Z]*.h.

public/web/WebOptionElement.h

Index: public/web/WebOptionElement.h
diff --git a/public/web/WebOptionElement.h b/public/web/WebOptionElement.h
index 7a336ae77d52df19cb2b7762115b0526b3c6ed17..dfbba7e730383727c2bcd206dab6911d2ef50b2f 100644
--- a/public/web/WebOptionElement.h
+++ b/public/web/WebOptionElement.h
@@ -34,12 +34,10 @@
 #include "../platform/WebVector.h"
 #include "WebElement.h"
 
-#if BLINK_IMPLEMENTATION
-namespace blink { class HTMLOptionElement; }
-#endif
-
 namespace blink {
 
+class HTMLOptionElement;
+
 // Provides readonly access to some properties of a DOM option element node.
 class WebOptionElement : public WebElement {
 public:
@@ -62,9 +60,9 @@ public:
     BLINK_EXPORT bool isEnabled() const;
 
 #if BLINK_IMPLEMENTATION
-    WebOptionElement(const PassRefPtrWillBeRawPtr<blink::HTMLOptionElement>&);
-    WebOptionElement& operator=(const PassRefPtrWillBeRawPtr<blink::HTMLOptionElement>&);
-    operator PassRefPtrWillBeRawPtr<blink::HTMLOptionElement>() const;
+    WebOptionElement(const PassRefPtrWillBeRawPtr<HTMLOptionElement>&);
+    WebOptionElement& operator=(const PassRefPtrWillBeRawPtr<HTMLOptionElement>&);
+    operator PassRefPtrWillBeRawPtr<HTMLOptionElement>() const;
 #endif
 };