Avoid underlining misspellings when typing inside a word

Source/core/editing/SpellChecker.cpp

Index: Source/core/editing/SpellChecker.cpp
diff --git a/Source/core/editing/SpellChecker.cpp b/Source/core/editing/SpellChecker.cpp
index dd5b107a72a68722b7dcd684b3428d0b8732bb34..d40e63d94ad34a835f1b02cc49661eda88b5fe3d 100644
--- a/Source/core/editing/SpellChecker.cpp
+++ b/Source/core/editing/SpellChecker.cpp
@@ -194,6 +194,14 @@ void SpellChecker::requestCheckingFor(PassRefPtr<SpellCheckRequest> request)
     invokeRequest(request);
 }
 
+void SpellChecker::cancelCheck()
+{
+    if (!m_requestQueue.isEmpty())
+        m_requestQueue.clear();
+    if (m_processingRequest)
+        m_processingRequest->didCancel();
+}
+
 void SpellChecker::invokeRequest(PassRefPtr<SpellCheckRequest> request)
 {
     ASSERT(!m_processingRequest);