Cleanup SkPicture* classes a bit

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 870ca4a3f6dee2e97a0d4faf9207cca76dfc8df3..3f1908be20f9d3dc191082369af97a064f50118c 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -1840,10 +1840,6 @@ void SkGpuDevice::EXPERIMENTAL_purge(const SkPicture* picture) {
 
 bool SkGpuDevice::EXPERIMENTAL_drawPicture(SkCanvas* canvas, const SkPicture* picture) {
 
-    if (NULL == picture->fData.get()) {
-        return false;
-    }
-
     SkPicture::AccelData::Key key = GPUAccelData::ComputeAccelDataKey();
 
     const SkPicture::AccelData* data = picture->EXPERIMENTAL_getAccelData(key);