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 ebaff997579d9e75c6e61779e33c61126ccc059a..b472b26e7edee09ccf878a80e5a1fb147fced0eb 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();