Fix Mac Debug clang build.

tests/ImageFilterTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBicubicImageFilter.h"
 #include "SkBitmap.h"
 #include "SkBitmapDevice.h"
@@ skipping 277 matching lines @@
     recordingCanvas->save();
     recordingCanvas->scale(SkIntToScalar(10), SkIntToScalar(10));
     recordingCanvas->drawRect(SkRect::Make(SkIRect::MakeWH(100, 100)), solidPaint);
     recordingCanvas->restore(); // scale
     recordingCanvas->restore(); // saveLayer
     picture.endRecording();
 
     canvas.drawPicture(picture);
 }
 
-void test_huge_blur(SkBaseDevice* device, skiatest::Reporter* reporter) {
+static void test_huge_blur(SkBaseDevice* device, skiatest::Reporter* reporter) {
     SkCanvas canvas(device);
 
     SkBitmap bitmap;
     bitmap.allocN32Pixels(100, 100);
     bitmap.eraseARGB(0, 0, 0, 0);
 
     // Check that a blur with an insane radius does not crash or assert.
     SkAutoTUnref<SkImageFilter> blur(SkBlurImageFilter::Create(SkIntToScalar(1<<30), SkIntToScalar(1<<30)));
 
     SkPaint paint;
@@ skipping 19 matching lines @@
 }
 
 DEF_GPUTEST(HugeBlurImageFilterGPU, reporter, factory) {
     GrContext* context = factory->get(static_cast<GrContextFactory::GLContextType>(0));
     SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(context,
                                                          SkImageInfo::MakeN32Premul(100, 100),
                                                          0));
     test_huge_blur(device, reporter);
 }
 #endif