Make previousBoundary() not to use Range object

Source/core/editing/VisibleUnits.cpp

Index: Source/core/editing/VisibleUnits.cpp
diff --git a/Source/core/editing/VisibleUnits.cpp b/Source/core/editing/VisibleUnits.cpp
index e1aec9163927b5fbd483dc0521612eecb22521eb..199a082dd719ade6733a16c37474992468c82cd5 100644
--- a/Source/core/editing/VisibleUnits.cpp
+++ b/Source/core/editing/VisibleUnits.cpp
@@ -26,8 +26,6 @@
 #include "config.h"
 #include "core/editing/VisibleUnits.h"
 
-#include "bindings/core/v8/ExceptionState.h"
-#include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
@@ -671,19 +669,14 @@ static VisiblePosition previousBoundary(const VisiblePosition& c, BoundarySearch
     if (!boundary)
         return VisiblePosition();
 
-    Document& d = boundary->document();
     Position start = Position::editingPositionOf(boundary, 0).parentAnchoredEquivalent();
     Position end = pos.parentAnchoredEquivalent();
 
     Vector<UChar, 1024> string;
     unsigned suffixLength = 0;
 
-    TrackExceptionState exceptionState;
     if (requiresContextForWordBoundary(characterBefore(c))) {
-        RefPtrWillBeRawPtr<Range> forwardsScanRange(d.createRange());
-        forwardsScanRange->setEndAfter(boundary, exceptionState);
-        forwardsScanRange->setStart(end.anchorNode(), end.offsetInContainerNode(), exceptionState);
-        TextIterator forwardsIterator(forwardsScanRange->startPosition(), forwardsScanRange->endPosition());
+        TextIterator forwardsIterator(end, Position::afterNode(boundary));
         while (!forwardsIterator.atEnd()) {
             Vector<UChar, 1024> characters;
             forwardsIterator.text().appendTextTo(characters);
@@ -696,10 +689,6 @@ static VisiblePosition previousBoundary(const VisiblePosition& c, BoundarySearch
         }
     }
 
-    ASSERT(!exceptionState.hadException());
-    if (exceptionState.hadException())
-        return VisiblePosition();
-
     SimplifiedBackwardsTextIterator it(start, end);
     unsigned next = 0;
     bool needMoreContext = false;