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

Source/core/editing/SurroundingText.cpp

Index: Source/core/editing/SurroundingText.cpp
diff --git a/Source/core/editing/SurroundingText.cpp b/Source/core/editing/SurroundingText.cpp
index 561ed88b6a01006635239dbeef198194290e04d6..a1481cbf2aab71c13601b105b182acb67e690a10 100644
--- a/Source/core/editing/SurroundingText.cpp
+++ b/Source/core/editing/SurroundingText.cpp
@@ -109,14 +109,12 @@ PassRefPtrWillBeRawPtr<Range> SurroundingText::rangeFromContentOffsets(unsigned
     ASSERT(!iterator.atEnd());
     iterator.advance(startOffsetInContent);
 
-    ASSERT(iterator.range());
-    Position start = iterator.range()->startPosition();
+    Position start = iterator.startPosition();
 
     ASSERT(!iterator.atEnd());
     iterator.advance(endOffsetInContent - startOffsetInContent);
 
-    ASSERT(iterator.range());
-    Position end = iterator.range()->startPosition();
+    Position end = iterator.startPosition();
 
     ASSERT(start.document());
     return Range::create(*start.document(), start, end);