WTF::notFound looks too much like a local variable.

Source/core/editing/InputMethodController.cpp

Index: Source/core/editing/InputMethodController.cpp
diff --git a/Source/core/editing/InputMethodController.cpp b/Source/core/editing/InputMethodController.cpp
index ed5347958eb65fbccc3e6876f30e1c5973ffb8e9..38bc074e820dd96115734a560c496867a375e5a0 100644
--- a/Source/core/editing/InputMethodController.cpp
+++ b/Source/core/editing/InputMethodController.cpp
@@ -44,8 +44,8 @@
 namespace WebCore {
 
 PlainTextOffsets::PlainTextOffsets()
-    : m_start(notFound)
-    , m_end(notFound)
+    : m_start(kNotFound)
+    , m_end(kNotFound)
 {
 }
 
@@ -53,8 +53,8 @@ PlainTextOffsets::PlainTextOffsets(int start, int end)
     : m_start(start)
     , m_end(end)
 {
-    ASSERT(start != notFound);
-    ASSERT(end != notFound);
+    ASSERT(start != kNotFound);
+    ASSERT(end != kNotFound);
     ASSERT(start <= end);
 }