don't leak the bitmapShader

BUG=skia:
R=fmalita@google.com, robertphillips@google.com, fmalita@chromium.org

Author: reed@google.com

Review URL: https://codereview.chromium.org/269163004

git-svn-id: http://skia.googlecode.com/svn/trunk@14588 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkPictureShader.cpp b/src/core/SkPictureShader.cpp
index 9555624..290baa8 100644
--- a/src/core/SkPictureShader.cpp
+++ b/src/core/SkPictureShader.cpp
@@ -119,7 +119,7 @@
     if (NULL == bitmapShader.get()) {
         return NULL;
     }
-    return PictureShaderContext::Create(storage, *this, rec, bitmapShader.detach());
+    return PictureShaderContext::Create(storage, *this, rec, bitmapShader);
 }
 
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