DevTools: remove UISourceCodeFrame from context when switching panels.

third_party/WebKit/Source/devtools/front_end/source_frame/SourcesTextEditor.js

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.CodeMirrorTextEditor}
  * @param {!WebInspector.SourcesTextEditorDelegate} delegate
  */
 WebInspector.SourcesTextEditor = function(delegate)
 {
     WebInspector.CodeMirrorTextEditor.call(this);
 
     this.codeMirror().addKeyMap({
         "Enter": "smartNewlineAndIndent",
         "Esc": "sourcesDismiss"
     });
 
     this._delegate = delegate;
 
     this.codeMirror().on("changes", this._changesForDelegate.bind(this));
     this.codeMirror().on("cursorActivity", this._cursorActivity.bind(this));
     this.codeMirror().on("gutterClick", this._gutterClick.bind(this));
     this.codeMirror().on("scroll", this._scroll.bind(this));
     this.codeMirror().on("focus", this._focus.bind(this));
+    this.codeMirror().on("blur", this._blur.bind(this));
     this.codeMirror().on("beforeSelectionChange", this._beforeSelectionChangeForDelegate.bind(this));
     this.element.addEventListener("contextmenu", this._contextMenu.bind(this), false);
 
     this._blockIndentController = new WebInspector.SourcesTextEditor.BlockIndentController(this.codeMirror());
     this._tokenHighlighter = new WebInspector.SourcesTextEditor.TokenHighlighter(this, this.codeMirror());
 
     /** @type {!Array<string>} */
     this._gutters = ["CodeMirror-linenumbers"];
 
     /**
@@ skipping 384 matching lines @@
     {
         var topmostLineNumber = this.codeMirror().lineAtHeight(this.codeMirror().getScrollInfo().top, "local");
         this._delegate.scrollChanged(topmostLineNumber);
     },
 
     _focus: function()
     {
         this._delegate.editorFocused();
     },
 
+    _blur: function()
+    {
+        this._delegate.editorBlurred();
+    },
+
     /**
      * @param {!CodeMirror} codeMirror
      * @param {{ranges: !Array.<{head: !CodeMirror.Pos, anchor: !CodeMirror.Pos}>}} selection
      */
     _beforeSelectionChangeForDelegate: function(codeMirror, selection)
     {
         if (!this._isHandlingMouseDownEvent)
             return;
         if (!selection.ranges.length)
             return;
@@ skipping 175 matching lines @@
      */
     selectionChanged: function(textRange) { },
 
     /**
      * @param {number} lineNumber
      */
     scrollChanged: function(lineNumber) { },
 
     editorFocused: function() { },
 
+    editorBlurred: function() { },
+
     /**
      * @param {!WebInspector.ContextMenu} contextMenu
      * @param {number} lineNumber
      * @return {!Promise}
      */
     populateLineGutterContextMenu: function(contextMenu, lineNumber) { },
 
     /**
      * @param {!WebInspector.ContextMenu} contextMenu
      * @param {number} lineNumber
@@ skipping 337 matching lines @@
         this._codeMirror.addOverlay(overlayMode);
         this._highlightDescriptor = {
             overlay: overlayMode,
             selectionStart: selectionStart
         };
     }
 }
 
 WebInspector.SourcesTextEditor.LinesToScanForIndentationGuessing = 1000;
 WebInspector.SourcesTextEditor.MaximumNumberOfWhitespacesPerSingleSpan = 16;