Use FrameSelection::selectedText where possible.

third_party/WebKit/Source/core/editing/FrameSelection.cpp

Index: third_party/WebKit/Source/core/editing/FrameSelection.cpp
diff --git a/third_party/WebKit/Source/core/editing/FrameSelection.cpp b/third_party/WebKit/Source/core/editing/FrameSelection.cpp
index 92dd256df027e44a2e9287c4f38f813934812ae8..c803ca02d39517a011b6ab908f2f836fffc73636 100644
--- a/third_party/WebKit/Source/core/editing/FrameSelection.cpp
+++ b/third_party/WebKit/Source/core/editing/FrameSelection.cpp
@@ -1118,6 +1118,8 @@ static String extractSelectedHTMLAlgorithm(const FrameSelection& selection)
 {
     const VisibleSelectionTemplate<Strategy> visibleSelection = selection.visibleSelection<Strategy>();
     const EphemeralRangeTemplate<Strategy> range = visibleSelection.toNormalizedEphemeralRange();
+    if (range.isNull())
+        return String();
     return createMarkup(range.startPosition(), range.endPosition(), AnnotateForInterchange, ConvertBlocksToInlines::NotConvert, ResolveNonLocalURLs);
 }
 
@@ -1128,9 +1130,9 @@ String FrameSelection::selectedHTMLForClipboard() const
     return extractSelectedHTMLAlgorithm<EditingInComposedTreeStrategy>(*this);
 }
 
-String FrameSelection::selectedText() const
+String FrameSelection::selectedText(TextIteratorBehavior behavior) const
 {
-    return extractSelectedText(*this, TextIteratorDefaultBehavior);
+    return extractSelectedText(*this, behavior);
 }
 
 String FrameSelection::selectedTextForClipboard() const