Remove removed uniscribe files from blink_platform.gypi

Clean up blink_platform.gypi and remove references to files that are
no longer part of the build.

TBR=leviw@chromium.org
BUG=313423

Review URL: https://codereview.chromium.org/213163002

git-svn-id: svn://svn.chromium.org/blink/trunk@170078 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/platform/blink_platform.gypi

@@ -406,11 +406,6 @@
       'fonts/win/FontFallbackWin.h',
       'fonts/win/FontPlatformDataWin.cpp',
       'fonts/win/FontPlatformDataWin.h',
-      'fonts/win/FontWin.cpp',
-      'fonts/win/UniscribeHelper.cpp',
-      'fonts/win/UniscribeHelper.h',
-      'fonts/win/UniscribeHelperTextRun.cpp',
-      'fonts/win/UniscribeHelperTextRun.h',
       'geometry/FloatBoxExtent.h',
       'geometry/FloatPolygon.cpp',
       'geometry/FloatPolygon.h',