Revert of Implement approx-match support in image filter saveLayer() offscreen.

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 5310c9f7d5254e03b18c32fb752e7ed745d16a5a..8426f090ec5949653ab516ffca3f7d33a317c338 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -936,6 +936,14 @@
     }
 
     SkBaseDevice::TileUsage usage = SkBaseDevice::kNever_TileUsage;
+#if 1
+    // this seems needed for current GMs, but makes us draw slower on the GPU
+    // Related to https://code.google.com/p/skia/issues/detail?id=3519 ?
+    //
+    if (paint && paint->getImageFilter()) {
+        usage = SkBaseDevice::kPossible_TileUsage;
+    }
+#endif
     device = device->onCreateDevice(SkBaseDevice::CreateInfo(info, usage, geo), paint);
     if (NULL == device) {
         SkErrorInternals::SetError( kInternalError_SkError,