Remove rt flags that are not necessary

tests/SurfaceTest.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 "SkCanvas.h"
 #include "SkData.h"
 #include "SkDevice.h"
@@ skipping 934 matching lines @@
     }
     GrTextureProvider* provider = ctx->textureProvider();
     
     const int w = 10;
     const int h = 10;
     SkPMColor storage[w * h];
     const SkPMColor expected0 = SkPreMultiplyColor(SK_ColorRED);
     sk_memset32(storage, expected0, w * h);
     
     GrSurfaceDesc desc;
-    desc.fFlags = kRenderTarget_GrSurfaceFlag;  // needs to be a rendertarget for readpixels();
     desc.fOrigin = kDefault_GrSurfaceOrigin;
     desc.fWidth = w;
     desc.fHeight = h;
     desc.fConfig = kSkia8888_GrPixelConfig;
     desc.fSampleCnt = 0;
     
     SkAutoTUnref<GrTexture> tex(provider->createTexture(desc, false, storage, w * 4));
     if (!tex) {
         REPORTER_ASSERT(reporter, false);
         return;
@@ skipping 16 matching lines @@
     // We expect the ref'd image to see the new color, but cpy'd one should still see the old color
     test_image_color(reporter, refImg, expected1);
     test_image_color(reporter, cpyImg, expected0);
 
     // Now exercise the release proc
     REPORTER_ASSERT(reporter, !releaseCtx.fIsReleased);
     refImg.reset(NULL); // force a release of the image
     REPORTER_ASSERT(reporter, releaseCtx.fIsReleased);
 }
 #endif