Remove unused includes from core/{editing,fileapi,history,html}

Source/core/html/ValidityState.cpp

Index: Source/core/html/ValidityState.cpp
diff --git a/Source/core/html/ValidityState.cpp b/Source/core/html/ValidityState.cpp
index 98cbdb79aeac51012490aa4d0a49116ea7af6756..b47a93cfa0aef110dc691b45ebff90be3a6a71f2 100644
--- a/Source/core/html/ValidityState.cpp
+++ b/Source/core/html/ValidityState.cpp
@@ -24,18 +24,8 @@
 #include "config.h"
 #include "core/html/ValidityState.h"
 
-#include "HTMLNames.h"
-#include "core/html/HTMLInputElement.h"
-#include "core/html/HTMLSelectElement.h"
-#include "core/html/HTMLTextAreaElement.h"
-#include "core/html/parser/HTMLTreeBuilder.h"
-#include "core/platform/LocalizedStrings.h"
-#include <wtf/StdLibExtras.h>
-
 namespace WebCore {
 
-using namespace HTMLNames;
-
 String ValidityState::validationMessage() const
 {
     return m_control->validationMessage();