Rename DOMFormData to FormData.

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 2582 matching lines @@
             'input/InputDeviceCapabilities.cpp',
             'input/InputDeviceCapabilities.h',
             'input/TouchActionUtil.cpp',
             'input/TouchActionUtil.h',
         ],
         'webcore_html_files': [
             'html/ClassList.cpp',
             'html/ClassList.h',
             'html/CrossOriginAttribute.cpp',
             'html/CrossOriginAttribute.h',
-            'html/DOMFormData.cpp',
-            'html/DOMFormData.h',
             'html/DocumentNameCollection.cpp',
             'html/DocumentNameCollection.h',
             'html/FormAssociatedElement.cpp',
+            'html/FormData.cpp',
+            'html/FormData.h',
             'html/FormDataList.cpp',
             'html/FormDataList.h',
             'html/HTMLAllCollection.cpp',
             'html/HTMLAllCollection.h',
             'html/HTMLAnchorElement.cpp',
             'html/HTMLAnchorElement.h',
             'html/HTMLAreaElement.cpp',
             'html/HTMLAreaElement.h',
             'html/HTMLAudioElement.cpp',
             'html/HTMLAudioElement.h',
@@ skipping 1174 matching lines @@
             'fileapi/FileListTest.cpp',
             'fileapi/FileTest.cpp',
             'frame/ImageBitmapTest.cpp',
             'frame/OriginsUsingFeaturesTest.cpp',
             'frame/RootFrameViewportTest.cpp',
             'frame/SubresourceIntegrityTest.cpp',
             'frame/UseCounterTest.cpp',
             'frame/csp/CSPSourceListTest.cpp',
             'frame/csp/CSPSourceTest.cpp',
             'frame/csp/ContentSecurityPolicyTest.cpp',
-            'html/DOMFormDataTest.cpp',
+            'html/FormDataTest.cpp',
             'html/HTMLDimensionTest.cpp',
             'html/HTMLFormControlElementTest.cpp',
             'html/HTMLImageElementTest.cpp',
             'html/HTMLInputElementTest.cpp',
             'html/HTMLLinkElementSizesAttributeTest.cpp',
             'html/HTMLSelectElementTest.cpp',
             'html/HTMLTableRowElementTest.cpp',
             'html/HTMLTextFormControlElementTest.cpp',
             'html/LinkRelAttributeTest.cpp',
             'html/TimeRangesTest.cpp',
@@ skipping 44 matching lines @@
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }