[DevTools] Make UI.GlassPane position contentElement for different overlay controls.

third_party/WebKit/Source/devtools/front_end/ui/SoftContextMenu.js

Index: third_party/WebKit/Source/devtools/front_end/ui/SoftContextMenu.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/SoftContextMenu.js b/third_party/WebKit/Source/devtools/front_end/ui/SoftContextMenu.js
index 2081f9956cd9d28ed7f9812ebcd43d2f16a6a8f6..effd8e87791165b2cc6ed6268eb31971bfe1c7b5 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/SoftContextMenu.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/SoftContextMenu.js
@@ -82,8 +82,9 @@ UI.SoftContextMenu = class {
     }
 
     // Re-position menu in case it does not fit.
-    var hostLeft = UI.Dialog.modalHostView().element.totalOffsetLeft();
-    var hostRight = hostLeft + UI.Dialog.modalHostView().element.offsetWidth;
+    var overlayRoot = UI.ModalOverlay.rootElement();
+    var hostLeft = overlayRoot.totalOffsetLeft();
+    var hostRight = hostLeft + overlayRoot.offsetWidth;
     if (hostRight < this.element.offsetLeft + this.element.offsetWidth) {
       var left = this._parentMenu ? this._parentMenu.element.offsetLeft - this.element.offsetWidth + subMenuOverlap :
                                     hostRight - this.element.offsetWidth;
@@ -92,13 +93,12 @@ UI.SoftContextMenu = class {
 
     // Move submenus upwards if it does not fit.
     if (this._parentMenu && document.body.offsetHeight < this.element.offsetTop + this.element.offsetHeight) {
-      y = Math.max(
-          UI.Dialog.modalHostView().element.totalOffsetTop(), document.body.offsetHeight - this.element.offsetHeight);
+      y = Math.max(overlayRoot.totalOffsetTop(), document.body.offsetHeight - this.element.offsetHeight);
       this.element.style.top = y + 'px';
     }
 
-    var maxHeight = UI.Dialog.modalHostView().element.offsetHeight;
-    maxHeight -= y - UI.Dialog.modalHostView().element.totalOffsetTop();
+    var maxHeight = overlayRoot.offsetHeight;
+    maxHeight -= y - overlayRoot.totalOffsetTop();
     this.element.style.maxHeight = maxHeight + 'px';
 
     this._focus();