Remove duplicate .cpp which should have been a .h

Review URL: https://codereview.chromium.org/1389923002
diff --git a/gyp/core.gypi b/gyp/core.gypi
index 2e2c1fd..e321e15 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -210,7 +210,7 @@
         '<(skia_src_path)/core/SkRecords.cpp',
         '<(skia_src_path)/core/SkRecordDraw.cpp',
         '<(skia_src_path)/core/SkRecordOpts.cpp',
-        '<(skia_src_path)/core/SkRecordOpts.cpp',
+        '<(skia_src_path)/core/SkRecordOpts.h',
         '<(skia_src_path)/core/SkRecordPattern.h',
         '<(skia_src_path)/core/SkRecorder.cpp',
         '<(skia_src_path)/core/SkRect.cpp',