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

public/web/WebTextRun.h

Index: public/web/WebTextRun.h
diff --git a/public/web/WebTextRun.h b/public/web/WebTextRun.h
index ca5d6a8e2ea96e868726bf0d8d62b3dc2cfaa455..c4a64e2f0918eb18c1766b16f3557c7272e37a75 100644
--- a/public/web/WebTextRun.h
+++ b/public/web/WebTextRun.h
@@ -33,12 +33,10 @@
 
 #include "../platform/WebString.h"
 
-#if BLINK_IMPLEMENTATION
-namespace blink { class TextRun; }
-#endif
-
 namespace blink {
 
+class TextRun;
+
 struct WebTextRun {
     WebTextRun(const WebString& t, bool isRTL, bool hasDirectionalOverride)
         : text(t)
@@ -59,7 +57,7 @@ struct WebTextRun {
 #if BLINK_IMPLEMENTATION
     // The resulting blink::TextRun will refer to the text in this
     // struct, so "this" must outlive the WebCore text run.
-    operator blink::TextRun() const;
+    operator TextRun() const;
 #endif
 };