Move ColorChooser{,Client} and DateTimeChooser{,Client} from platform to core.

Source/core/core.gypi

 {
     'includes': [
       'core_generated.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',
@@ skipping 2630 matching lines @@
             'html/forms/BaseDateAndTimeInputType.cpp',
             'html/forms/BaseDateAndTimeInputType.h',
             'html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp',
             'html/forms/BaseMultipleFieldsDateAndTimeInputType.h',
             'html/forms/BaseTextInputType.cpp',
             'html/forms/BaseTextInputType.h',
             'html/forms/ButtonInputType.cpp',
             'html/forms/ButtonInputType.h',
             'html/forms/CheckboxInputType.cpp',
             'html/forms/CheckboxInputType.h',
+            'html/forms/ColorChooser.cpp',
+            'html/forms/ColorChooser.h',
+            'html/forms/ColorChooserClient.cpp',
+            'html/forms/ColorChooserClient.h',
             'html/forms/ColorInputType.cpp',
             'html/forms/ColorInputType.h',
             'html/forms/DateInputType.cpp',
             'html/forms/DateInputType.h',
+            'html/forms/DateTimeChooser.cpp',
+            'html/forms/DateTimeChooser.h',
+            'html/forms/DateTimeChooserClient.cpp',
+            'html/forms/DateTimeChooserClient.h',
             'html/forms/DateTimeFieldsState.cpp',
             'html/forms/DateTimeFieldsState.h',
             'html/forms/DateTimeLocalInputType.cpp',
             'html/forms/DateTimeLocalInputType.h',
             'html/forms/EmailInputType.cpp',
             'html/forms/EmailInputType.h',
             'html/forms/FileInputType.cpp',
             'html/forms/FileInputType.h',
             'html/forms/FormController.cpp',
             'html/forms/FormController.h',
@@ skipping 803 matching lines @@
             'rendering/shapes/BoxShapeTest.cpp',
             'rendering/style/OutlineValueTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }