Remove some unused functions in core

Source/core/plugins/DOMPlugin.cpp

Index: Source/core/plugins/DOMPlugin.cpp
diff --git a/Source/core/plugins/DOMPlugin.cpp b/Source/core/plugins/DOMPlugin.cpp
index 69f998f4d9bbb25ecd7925b5a6e773d1c932e2f4..0c54f391e12d0bde9acef616574f91acff48d93e 100644
--- a/Source/core/plugins/DOMPlugin.cpp
+++ b/Source/core/plugins/DOMPlugin.cpp
@@ -75,15 +75,6 @@ PassRefPtrWillBeRawPtr<DOMMimeType> DOMPlugin::item(unsigned index)
     return nullptr;
 }
 
-bool DOMPlugin::canGetItemsForName(const AtomicString& propertyName)
-{
-    const Vector<MimeClassInfo>& mimes = m_pluginData->mimes();
-    for (unsigned i = 0; i < mimes.size(); ++i)
-        if (mimes[i].type == propertyName)
-            return true;
-    return false;
-}
-
 PassRefPtrWillBeRawPtr<DOMMimeType> DOMPlugin::namedItem(const AtomicString& propertyName)
 {
     const Vector<MimeClassInfo>& mimes = m_pluginData->mimes();