Cache the mimeTypes and plugins DOM objects.

third_party/WebKit/Source/modules/plugins/DOMPlugin.cpp

Index: third_party/WebKit/Source/modules/plugins/DOMPlugin.cpp
diff --git a/third_party/WebKit/Source/modules/plugins/DOMPlugin.cpp b/third_party/WebKit/Source/modules/plugins/DOMPlugin.cpp
index 02d8b7c12b64632b4ae5eea3e28e384070191c55..0721fca8b3e46cba621670c5014207957c2f8b1d 100644
--- a/third_party/WebKit/Source/modules/plugins/DOMPlugin.cpp
+++ b/third_party/WebKit/Source/modules/plugins/DOMPlugin.cpp
@@ -18,7 +18,11 @@
 
 #include "modules/plugins/DOMPlugin.h"
 
+#include "core/frame/LocalDOMWindow.h"
+#include "modules/plugins/DOMMimeTypeArray.h"
+#include "modules/plugins/NavigatorPlugins.h"
 #include "platform/plugins/PluginData.h"
+
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
@@ -69,7 +73,7 @@ DOMMimeType* DOMPlugin::item(unsigned index)
     const Vector<MimeClassInfo>& mimes = m_pluginData->mimes();
     for (unsigned i = 0; i < mimes.size(); ++i) {
         if (mimes[i] == mime && m_pluginData->mimePluginIndices()[i] == m_index)
-            return DOMMimeType::create(m_pluginData.get(), frame(), i);
+            return NavigatorPlugins::mimeTypes(*frame()->domWindow()->navigator())->getMimeType(i);
     }
     return nullptr;
 }
@@ -79,7 +83,7 @@ DOMMimeType* DOMPlugin::namedItem(const AtomicString& propertyName)
     const Vector<MimeClassInfo>& mimes = m_pluginData->mimes();
     for (unsigned i = 0; i < mimes.size(); ++i) {
         if (mimes[i].type == propertyName)
-            return DOMMimeType::create(m_pluginData.get(), frame(), i);
+            return NavigatorPlugins::mimeTypes(*frame()->domWindow()->navigator())->getMimeType(i);
     }
     return nullptr;
 }