Stop inlining StringBuffer<CharType>::shrink().

Source/wtf/text/StringBuffer.h

Index: Source/wtf/text/StringBuffer.h
diff --git a/Source/wtf/text/StringBuffer.h b/Source/wtf/text/StringBuffer.h
index 2498f5d295ff3b0eab3dace622ee6c00558a52d6..952cfb4041633c2daac69c10bde99ee49c6f0122 100644
--- a/Source/wtf/text/StringBuffer.h
+++ b/Source/wtf/text/StringBuffer.h
@@ -51,13 +51,7 @@ public:
     {
     }
 
-    void shrink(unsigned newLength)
-    {
-        if (m_data->length() == newLength)
-            return;
-        m_data->truncateAssumingIsolated(newLength);
-    }
-
+    void shrink(unsigned newLength);
     void resize(unsigned newLength)
     {
         if (!m_data) {
@@ -83,6 +77,15 @@ private:
     RefPtr<StringImpl> m_data;
 };
 
+template <typename CharType>
+void StringBuffer<CharType>::shrink(unsigned newLength)
+{
+    ASSERT(m_data);
+    if (m_data->length() == newLength)
+        return;
+    m_data->truncateAssumingIsolated(newLength);
+}
+
 } // namespace WTF
 
 using WTF::StringBuffer;