Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/core/html/shadow/TextControlInnerElements.cpp

Index: Source/core/html/shadow/TextControlInnerElements.cpp
diff --git a/Source/core/html/shadow/TextControlInnerElements.cpp b/Source/core/html/shadow/TextControlInnerElements.cpp
index fded6f732ec73fb64cc34f7af3c4bb149bdccda0..3c6ea84e36ea8b4ea7d789f2eae47b76d4477634 100644
--- a/Source/core/html/shadow/TextControlInnerElements.cpp
+++ b/Source/core/html/shadow/TextControlInnerElements.cpp
@@ -264,12 +264,16 @@ inline InputFieldSpeechButtonElement::InputFieldSpeechButtonElement(Document& do
 
 InputFieldSpeechButtonElement::~InputFieldSpeechButtonElement()
 {
+#if !ENABLE(OILPAN)
+    // With Oilpan, this cleanup is handled with weak processing of the
+    // SpeechInputs.
     SpeechInput* speech = speechInput();
     if (speech && m_listenerId)  { // Could be null when page is unloading.
         if (m_state != Idle)
             speech->cancelRecognition(m_listenerId);
         speech->unregisterListener(m_listenerId);
     }
+#endif
 }
 
 PassRefPtr<InputFieldSpeechButtonElement> InputFieldSpeechButtonElement::create(Document& document)