Introduce NavigatorOnLine interface

Source/core/core.gypi

 {
     'variables': {
         'deprecated_perl_core_idl_files': [
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSMediaRule.idl',
@@ skipping 227 matching lines @@
             'inspector/JavaScriptCallFrame.idl',
             'loader/appcache/DOMApplicationCache.idl',
             'page/BarProp.idl',
             'page/Console.idl',
             'page/EventSource.idl',
             'page/History.idl',
             'page/ImageBitmap.idl',
             'page/Location.idl',
             'page/MemoryInfo.idl',
             'page/Navigator.idl',
+            'page/NavigatorOnLine.idl',
             'page/PagePopupController.idl',
             'page/Performance.idl',
             'page/PerformanceEntry.idl',
             'page/PerformanceMark.idl',
             'page/PerformanceMeasure.idl',
             'page/PerformanceNavigation.idl',
             'page/PerformanceResourceTiming.idl',
             'page/PerformanceTiming.idl',
             'page/Screen.idl',
             'page/SecurityPolicy.idl',
@@ skipping 931 matching lines @@
             'page/LayoutMilestones.h',
             'page/Location.cpp',
             'page/Location.h',
             'page/MemoryInfo.cpp',
             'page/MouseEventWithHitTestResults.cpp',
             'page/MouseEventWithHitTestResults.h',
             'page/Navigator.cpp',
             'page/Navigator.h',
             'page/NavigatorBase.cpp',
             'page/NavigatorBase.h',
+            'page/NavigatorOnLine.h',
             'page/Page.cpp',
             'page/PageConsole.cpp',
             'page/PageGroup.cpp',
             'page/PageGroupLoadDeferrer.cpp',
             'page/PageGroupLoadDeferrer.h',
             'page/PageLifecycleNotifier.cpp',
             'page/PageLifecycleNotifier.h',
             'page/PageLifecycleObserver.cpp',
             'page/PageLifecycleObserver.h',
             'page/PagePopupController.cpp',
@@ skipping 2630 matching lines @@
                 'bison_exe': 'bison',
                 # We specify a preprocess so it happens locally and won't get
                 # distributed to goma.
                 # FIXME: /usr/bin/gcc won't exist on OSX forever. We want to
                 # use /usr/bin/clang once we require Xcode 4.x.
                 'preprocessor': '--preprocessor "/usr/bin/gcc -E -P -x c++"'
               }],
          ],
     }
 }