Fix a memory leak in the new Canvas/Device workflow.

The previous change made it difficult to inherit from SkCanvas without leaking memory.  By making SkDeviceFactory not reference counted, the right thing happens more naturally, just NewCanvas : public SkCanvas(new NewDeviceFactory()) {...}

Review URL: http://codereview.appspot.com/2530042

git-svn-id: http://skia.googlecode.com/svn/trunk@605 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed