Avoid allocating temporary ranges in connection with text and character iterators.

Source/core/editing/VisibleSelection.cpp

Index: Source/core/editing/VisibleSelection.cpp
diff --git a/Source/core/editing/VisibleSelection.cpp b/Source/core/editing/VisibleSelection.cpp
index 411437768c0c3bf2662cf67cf1c0bde506e3a3eb..62b6ae237bf3c60ad89d53655603d50bffaba1d8 100644
--- a/Source/core/editing/VisibleSelection.cpp
+++ b/Source/core/editing/VisibleSelection.cpp
@@ -303,7 +303,7 @@ void VisibleSelection::appendTrailingWhitespace()
         UChar c = charIt.characterAt(0);
         if ((!isSpaceOrNewline(c) && c != noBreakSpace) || c == '\n')
             break;
-        m_end = charIt.range()->endPosition();
+        m_end = charIt.endPosition();
         changed = true;
     }
     if (changed)