Change all uses of the RoundedRect class to use FloatRoundedRect instead.

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 423 matching lines @@
       'geometry/IntSize.h',
       'geometry/IntSizeHash.h',
       'geometry/LayoutBoxExtent.cpp',
       'geometry/LayoutBoxExtent.h',
       'geometry/LayoutPoint.h',
       'geometry/LayoutRect.cpp',
       'geometry/LayoutRect.h',
       'geometry/LayoutSize.h',
       'geometry/Region.cpp',
       'geometry/Region.h',
-      'geometry/RoundedRect.cpp',
-      'geometry/RoundedRect.h',
       'geometry/TransformState.cpp',
       'geometry/TransformState.h',
       'geometry/cg/FloatPointCG.cpp',
       'geometry/cg/FloatRectCG.cpp',
       'geometry/cg/FloatSizeCG.cpp',
       'geometry/cg/IntPointCG.cpp',
       'geometry/cg/IntRectCG.cpp',
       'geometry/cg/IntSizeCG.cpp',
       'geometry/mac/FloatPointMac.mm',
       'geometry/mac/FloatRectMac.mm',
@@ skipping 514 matching lines @@
       'graphics/ImageFrameGeneratorTest.cpp',
       'graphics/ImageLayerChromiumTest.cpp',
       'graphics/test/MockImageDecoder.h',
       'graphics/test/MockWebGraphicsContext3D.h',
       'image-decoders/gif/GIFImageDecoderTest.cpp',
       'image-decoders/jpeg/JPEGImageDecoderTest.cpp',
       'image-decoders/webp/WEBPImageDecoderTest.cpp',
     ],
   },
 }