Clean up likely reference leak in Ganesh custom stages.

http://codereview.appspot.com/6286047/



git-svn-id: http://skia.googlecode.com/svn/trunk@4146 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index de9d973..056c5d8 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -540,15 +540,16 @@
     GrSamplerState* sampler = grPaint->textureSampler(kShaderTextureIdx);
     switch (bmptype) {
     case SkShader::kRadial_BitmapType: {
-        sampler->setCustomStage(new GrRadialGradient());
+        sampler->setCustomStage(new GrRadialGradient())->unref();
         } break;
     case SkShader::kSweep_BitmapType: {
-        sampler->setCustomStage(new GrSweepGradient());
+        sampler->setCustomStage(new GrSweepGradient())->unref();
         } break;
     case SkShader::kTwoPointRadial_BitmapType: {
-        sampler->setCustomStage(new GrRadial2Gradient(twoPointParams[0],
-                                                      twoPointParams[1],
-                                                      twoPointParams[2] < 0));
+        sampler->setCustomStage(new
+            GrRadial2Gradient(twoPointParams[0],
+                              twoPointParams[1],
+                              twoPointParams[2] < 0))->unref();
         } break;
     default:
         break;