DevTools: drastically simplify UISourceCode.checkContentUpdated

third_party/WebKit/Source/devtools/front_end/sources/UISourceCodeFrame.js

Index: third_party/WebKit/Source/devtools/front_end/sources/UISourceCodeFrame.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/UISourceCodeFrame.js b/third_party/WebKit/Source/devtools/front_end/sources/UISourceCodeFrame.js
index 53e49541b293e5da5a2d1219ef4d9b6de287efc9..7ee4c75ff3c619712a21ddc60e5d3a193e0d7012 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/UISourceCodeFrame.js
+++ b/third_party/WebKit/Source/devtools/front_end/sources/UISourceCodeFrame.js
@@ -130,9 +130,6 @@ Sources.UISourceCodeFrame = class extends SourceFrame.SourceFrame {
    */
   wasShown() {
     super.wasShown();
-    this._boundWindowFocused = this._windowFocused.bind(this);
-    this.element.ownerDocument.defaultView.addEventListener('focus', this._boundWindowFocused, false);
-    this._checkContentUpdated();
     // We need CodeMirrorTextEditor to be initialized prior to this call as it calls |cursorPositionToCoordinates| internally. @see crbug.com/506566
     setImmediate(this._updateBucketDecorations.bind(this));
   }
@@ -143,8 +140,6 @@ Sources.UISourceCodeFrame = class extends SourceFrame.SourceFrame {
   willHide() {
     super.willHide();
     UI.context.setFlavor(Sources.UISourceCodeFrame, null);
-    this.element.ownerDocument.defaultView.removeEventListener('focus', this._boundWindowFocused, false);
-    delete this._boundWindowFocused;
     this._uiSourceCode.removeWorkingCopyGetter();
   }
 
@@ -161,16 +156,6 @@ Sources.UISourceCodeFrame = class extends SourceFrame.SourceFrame {
     return this._uiSourceCode.contentType() !== Common.resourceTypes.Document;
   }
 
-  _windowFocused(event) {
-    this._checkContentUpdated();
-  }
-
-  _checkContentUpdated() {
-    if (!this.loaded || !this.isShowing())
-      return;
-    this._uiSourceCode.checkContentUpdated(true);
-  }
-
   commitEditing() {
     if (!this._uiSourceCode.isDirty())
       return;