DevTools: Get rid of module initializers in the source tree

Source/devtools/front_end/sources/_module.js

-// Copyright 2014 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.
-
-importScript("jsdifflib.js")
-importScript("Placard.js");
-importScript("AddSourceMapURLDialog.js");
-importScript("BreakpointsSidebarPane.js");
-importScript("CallStackSidebarPane.js");
-importScript("SimpleHistoryManager.js");
-importScript("EditingLocationHistoryManager.js");
-importScript("FilePathScoreFunction.js");
-importScript("FilteredItemSelectionDialog.js");
-importScript("UISourceCodeFrame.js");
-importScript("JavaScriptSourceFrame.js");
-importScript("CSSSourceFrame.js");
-importScript("NavigatorView.js");
-importScript("RevisionHistoryView.js");
-importScript("ScopeChainSidebarPane.js");
-importScript("SourcesNavigator.js");
-importScript("StyleSheetOutlineDialog.js");
-importScript("TabbedEditorContainer.js");
-importScript("WatchExpressionsSidebarPane.js");
-importScript("WorkersSidebarPane.js");
-importScript("ThreadsSidebarPane.js");
-importScript("ScriptFormatterEditorAction.js");
-importScript("InplaceFormatterEditorAction.js");
-importScript("ScriptFormatter.js");
-importScript("SourcesView.js");
-
-// Search results pane
-importScript("AdvancedSearchView.js");
-importScript("FileBasedSearchResultsPane.js");
-importScript("SourcesSearchScope.js");
-
-importScript("SourcesPanel.js");