The start and end arguments should be unsigned long in setSelectionRange() function

Source/modules/accessibility/AXObject.h

Index: Source/modules/accessibility/AXObject.h
diff --git a/Source/modules/accessibility/AXObject.h b/Source/modules/accessibility/AXObject.h
index 92f50f360b6eb676d5d14184d947e7e703ed6c8f..087ae3fdfe58aebede33fcd6c3d59f2093271677 100644
--- a/Source/modules/accessibility/AXObject.h
+++ b/Source/modules/accessibility/AXObject.h
@@ -414,30 +414,30 @@ public:
         RefPtrWillBePersistent<AXObject> anchorObject;
         // The number of characters and child objects in the anchor object
         // before the range starts.
-        int anchorOffset;
+        unsigned anchorOffset;
         // The deepest descendant in which the range ends.
         // (nullptr means the current object.)
         RefPtrWillBePersistent<AXObject> focusObject;
         // The number of characters and child objects in the focus object
         // before the range ends.
-        int focusOffset;
+        unsigned focusOffset;
 
         AXRange()
             : anchorObject(nullptr)
-            , anchorOffset(-1)
+            , anchorOffset(UINT_MAX)
             , focusObject(nullptr)
-            , focusOffset(-1)
+            , focusOffset(UINT_MAX)
         { }
 
-        AXRange(int startOffset, int endOffset)
+        AXRange(unsigned startOffset, unsigned endOffset)
             : anchorObject(nullptr)
             , anchorOffset(startOffset)
             , focusObject(nullptr)
             , focusOffset(endOffset)
         { }
 
-        AXRange(PassRefPtrWillBeRawPtr<AXObject> anchorObject, int anchorOffset,
-            PassRefPtrWillBeRawPtr<AXObject> focusObject, int focusOffset)
+        AXRange(PassRefPtrWillBeRawPtr<AXObject> anchorObject, unsigned anchorOffset,
+            PassRefPtrWillBeRawPtr<AXObject> focusObject, unsigned focusOffset)
             : anchorObject(anchorObject)
             , anchorOffset(anchorOffset)
             , focusObject(focusObject)
@@ -447,8 +447,7 @@ public:
         bool isValid() const
         {
             return ((anchorObject && focusObject)
-                || (!anchorObject && !focusObject))
-                && anchorOffset >= 0 && focusOffset >= 0;
+                || (!anchorObject && !focusObject));
         }
 
         // Determines if the range only refers to text offsets under the current object.