DevTools: Rename inspector.js -> Main.js to follow the type name

Source/devtools/devtools.gypi

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #         * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 81 matching lines @@
             'front_end/ImageView.js',
             'front_end/IndexedDBModel.js',
             'front_end/InplaceEditor.js',
             'front_end/InplaceFormatterEditorAction.js',
             'front_end/InspectElementModeController.js',
             'front_end/InspectedPagePlaceholder.js',
             'front_end/InspectorBackend.js',
             'front_end/InspectorFrontendAPI.js',
             'front_end/InspectorFrontendHostStub.js',
             'front_end/InspectorView.js',
-            'front_end/inspector.js',
             'front_end/IsolatedFileSystem.js',
             'front_end/IsolatedFileSystemManager.js',
             'front_end/jsdifflib.js',
             'front_end/KeyboardShortcut.js',
             'front_end/Linkifier.js',
             'front_end/LiveEditSupport.js',
+            'front_end/Main.js',
             'front_end/ModuleManager.js',
             'front_end/NativeBreakpointsSidebarPane.js',
             'front_end/NetworkManager.js',
             'front_end/NetworkLog.js',
             'front_end/NetworkRequest.js',
             'front_end/NetworkUISourceCodeProvider.js',
             'front_end/NotificationService.js',
             'front_end/Object.js',
             'front_end/ObjectPopoverHelper.js',
             'front_end/ObjectPropertiesSection.js',
@@ skipping 357 matching lines @@
             'front_end/TempStorageSharedWorker.js',
         ],
         'devtools_script_formatter_worker_js_files': [
             'front_end/CSSFormatter.js',
             'front_end/JavaScriptFormatter.js',
             'front_end/ScriptFormatterWorker.js',
             'front_end/utilities.js',
         ],
     },
 }