Fix utils.gyp missing file

TBR=robertphillips@google.com

Review URL: https://codereview.chromium.org/142043003

git-svn-id: http://skia.googlecode.com/svn/trunk@13125 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/utils.gyp b/gyp/utils.gyp
index ebac571..37fe25d 100644
--- a/gyp/utils.gyp
+++ b/gyp/utils.gyp
@@ -42,7 +42,6 @@
         '../include/utils/SkDebugUtils.h',
         '../include/utils/SkDeferredCanvas.h',
         '../include/utils/SkDumpCanvas.h',
-        '../include/utils/SkGatherPixelRefsAndRects.h',
         '../include/utils/SkInterpolator.h',
         '../include/utils/SkLayer.h',
         '../include/utils/SkMatrix44.h',
@@ -78,6 +77,7 @@
         '../src/utils/SkDumpCanvas.cpp',
         '../src/utils/SkFloatUtils.h',
         '../src/utils/SkGatherPixelRefsAndRects.cpp',
+        '../src/utils/SkGatherPixelRefsAndRects.h',
         '../src/utils/SkInterpolator.cpp',
         '../src/utils/SkLayer.cpp',
         '../src/utils/SkMatrix44.cpp',