Merge 86683 - 2011-05-17 Pavel Feldman <pfeldman@google.com>

Source/WebCore/inspector/front-end/TextViewer.js

Index: Source/WebCore/inspector/front-end/TextViewer.js
===================================================================
--- Source/WebCore/inspector/front-end/TextViewer.js	(revision 86685)
+++ Source/WebCore/inspector/front-end/TextViewer.js	(working copy)
@@ -108,6 +108,9 @@
 
     highlightLine: function(lineNumber)
     {
+        if (typeof lineNumber !== "number" || lineNumber < 0)
+            return;
+
         this._mainPanel.highlightLine(lineNumber);
     },
 
@@ -406,6 +409,12 @@
     {
         var chunkNumber = this._chunkNumberForLine(lineNumber);
         var oldChunk = this._textChunks[chunkNumber];
+
+        if (!oldChunk) {
+            console.error("No chunk for line number: " + lineNumber);
+            return;
+        }
+
         if (oldChunk.linesCount === 1)
             return oldChunk;