Get rid of TreeBoundaryCrossingRules.

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 1200 matching lines @@
             'css/StyleRuleImport.h',
             'css/StyleRuleKeyframe.cpp',
             'css/StyleRuleKeyframe.h',
             'css/StyleRuleNamespace.h',
             'css/StyleSheet.cpp',
             'css/StyleSheet.h',
             'css/StyleSheetContents.cpp',
             'css/StyleSheetContents.h',
             'css/StyleSheetList.cpp',
             'css/StyleSheetList.h',
-            'css/TreeBoundaryCrossingRules.cpp',
-            'css/TreeBoundaryCrossingRules.h',
             'css/invalidation/DescendantInvalidationSet.cpp',
             'css/invalidation/DescendantInvalidationSet.h',
             'css/invalidation/StyleInvalidator.cpp',
             'css/invalidation/StyleInvalidator.h',
             'css/invalidation/StyleSheetInvalidationAnalysis.cpp',
             'css/invalidation/StyleSheetInvalidationAnalysis.h',
             'css/parser/BisonCSSParser.h',
             'css/parser/BisonCSSTokenizer.h',
             'css/parser/CSSParser.cpp',
             'css/parser/CSSParser.h',
@@ skipping 2655 matching lines @@
             'streams/ReadableStreamTest.cpp',
             'style/ComputedStyleTest.cpp',
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }