Merge ChildNodeInsertionNotifier and ChildNodeRemovalNotifier into ContainerNode

Source/core/core.gypi

 {
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationPlayer.idl',
             'animation/AnimationNode.idl',
             'animation/AnimationTimeline.idl',
             'animation/Timing.idl',
@@ skipping 1919 matching lines @@
             'dom/ChildNodeList.h',
             'dom/ClassCollection.cpp',
             'dom/ClassCollection.h',
             'dom/ClientRect.cpp',
             'dom/ClientRect.h',
             'dom/ClientRectList.cpp',
             'dom/ClientRectList.h',
             'dom/Comment.cpp',
             'dom/Comment.h',
             'dom/ContainerNode.cpp',
-            'dom/ContainerNodeAlgorithms.cpp',
             'dom/ContainerNodeAlgorithms.h',
             'dom/ContextFeatures.cpp',
             'dom/ContextFeatures.h',
             'dom/ContextLifecycleNotifier.cpp',
             'dom/ContextLifecycleNotifier.h',
             'dom/ContextLifecycleObserver.cpp',
             'dom/ContextLifecycleObserver.h',
             'dom/CrossThreadTask.h',
             'dom/DOMError.cpp',
             'dom/DOMError.h',
@@ skipping 1447 matching lines @@
             'loader/MixedContentCheckerTest.cpp',
             'page/NetworkStateNotifierTest.cpp',
             'rendering/RenderOverflowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }