DevTools: Extract SourcesEditor from SourcesPanel.

LayoutTests/inspector/sources/debugger/source-frame-count.html

Index: LayoutTests/inspector/sources/debugger/source-frame-count.html
diff --git a/LayoutTests/inspector/sources/debugger/source-frame-count.html b/LayoutTests/inspector/sources/debugger/source-frame-count.html
index 29a5f6c021960ff6bc30fa8de1220d83ab8319d1..6240d758d33d462ff0cc8228a8b091cd3043a097 100644
--- a/LayoutTests/inspector/sources/debugger/source-frame-count.html
+++ b/LayoutTests/inspector/sources/debugger/source-frame-count.html
@@ -14,7 +14,6 @@ function test()
         function testSourceFramesCount(next)
         {
             var panel = WebInspector.panels.sources;
-            var select = panel._navigator._filesSelectElement;
             var sourceFrameCount = 0;
 
             InspectorTest.showScriptSource("source-frame-count.html", step2);
@@ -49,7 +48,7 @@ function test()
 
             function didShowScriptSourceAgain()
             {
-                InspectorTest.assertTrue(panel._editorContainer.visibleView._uiSourceCode.originURL().indexOf("script3.js") !== -1);
+                InspectorTest.assertTrue(panel.visibleView._uiSourceCode.originURL().indexOf("script3.js") !== -1);

[lushnikov, 2014/03/20 13:13:43]

shouldn't it be sourcesEditor() here instead of visible view? sourcesEditor() is
easier to read.

                 // There should be maximum 3 source frames shown:
                 //  - first one is the first shown (first tab added)
                 //  - second one is the last viewed ("script2.js")