Cleanup: Go with SkDebugf instead of GrPrintf.

Since GrPrintf is just defined to SkDebugf, we can go with the later
directly.

BUG=None
TEST=None
R=bsalomon@google.com

Review URL: https://codereview.chromium.org/695663003
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 35c3ab5..330a2fc 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -1777,7 +1777,7 @@
     if (texture.get()) {
         return SkGpuDevice::Create(texture, SkSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType), flags);
     } else {
-        GrPrintf("---- failed to create compatible device texture [%d %d]\n",
+        SkDebugf("---- failed to create compatible device texture [%d %d]\n",
                  info.width(), info.height());
         return NULL;
     }