Simplify and test SVGInterpolation effect application

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 897 matching lines @@
             'animation/PaintPropertyFunctions.h',
             'animation/PrimitiveInterpolation.h',
             'animation/PropertyHandle.cpp',
             'animation/PropertyHandle.h',
             'animation/SVGAngleInterpolationType.cpp',
             'animation/SVGAngleInterpolationType.h',
             'animation/SVGIntegerInterpolationType.cpp',
             'animation/SVGIntegerInterpolationType.h',
             'animation/SVGIntegerOptionalIntegerInterpolationType.cpp',
             'animation/SVGIntegerOptionalIntegerInterpolationType.h',
-            'animation/SVGInterpolation.cpp',
             'animation/SVGInterpolation.h',
             'animation/SVGInterpolationType.cpp',
             'animation/SVGInterpolationType.h',
             'animation/SVGNumberInterpolationType.cpp',
             'animation/SVGNumberInterpolationType.h',
             'animation/SVGNumberListInterpolationType.cpp',
             'animation/SVGNumberListInterpolationType.h',
             'animation/SVGNumberOptionalNumberInterpolationType.cpp',
             'animation/SVGNumberOptionalNumberInterpolationType.h',
             'animation/SVGPointListInterpolationType.cpp',
@@ skipping 3020 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }