Revert of Move SelectionAdjust to its own file

third_party/WebKit/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 1381 matching lines @@
             'editing/PlainTextRange.cpp',
             'editing/PlainTextRange.h',
             'editing/Position.cpp',
             'editing/Position.h',
             'editing/PositionIterator.cpp',
             'editing/PositionIterator.h',
             'editing/PositionWithAffinity.cpp',
             'editing/PositionWithAffinity.h',
             'editing/RenderedPosition.cpp',
             'editing/RenderedPosition.h',
-            'editing/SelectionAdjuster.cpp',
-            'editing/SelectionAdjuster.h',
             'editing/SelectionController.cpp',
             'editing/SelectionController.h',
             'editing/SelectionEditor.cpp',
             'editing/SelectionEditor.h',
             'editing/SelectionType.h',
             'editing/SurroundingText.cpp',
             'editing/SurroundingText.h',
             'editing/VisiblePosition.cpp',
             'editing/VisibleSelection.cpp',
             'editing/VisibleUnits.cpp',
@@ skipping 2626 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }