eliminate typedef only being used once

Change-Id: I1e54968a67f3edce3b2297ea1932d5b07e2da643

canvas/source/tools/surfaceproxy.hxx

@@ -114,8 +114,6 @@ namespace canvas
         // 32bit rgba and can have any size.
         canvas::IColorBufferSharedPtr mpBuffer;
     };
-
-    typedef std::shared_ptr< SurfaceProxy > SurfaceProxySharedPtr;
 }
 
 #endif

canvas/source/tools/surfaceproxymanager.cxx

@@ -53,7 +53,7 @@ namespace canvas
             // not much to do for now, simply allocate a new surface
             // proxy from our internal pool and initialize this thing
             // properly. we *don't* create a hardware surface for now.
-            return SurfaceProxySharedPtr(new SurfaceProxy(pBuffer,mpPageManager));
+            return std::shared_ptr<ISurfaceProxy>(new SurfaceProxy(pBuffer,mpPageManager));
         }
 
     private: