Make SkGpuDevice constructors private.

debugger/QT/SkGLWidget.cpp

Index: debugger/QT/SkGLWidget.cpp
diff --git a/debugger/QT/SkGLWidget.cpp b/debugger/QT/SkGLWidget.cpp
index 019654fe0d282a4c027c8e74eb482a94e4d438bb..602dc24fda85aa1864e3fcd16187ce1fbcbfd550 100644
--- a/debugger/QT/SkGLWidget.cpp
+++ b/debugger/QT/SkGLWidget.cpp
@@ -47,7 +47,7 @@ void SkGLWidget::initializeGL() {
     GrBackendRenderTargetDesc desc = this->getDesc(this->width(), this->height());
     desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
     GrRenderTarget* curRenderTarget = fCurContext->wrapBackendRenderTarget(desc);
-    fGpuDevice = new SkGpuDevice(fCurContext, curRenderTarget);
+    fGpuDevice = SkGpuDevice::Create(curRenderTarget);
     fCanvas = new SkCanvas(fGpuDevice);
     curRenderTarget->unref();
 }
@@ -65,7 +65,7 @@ void SkGLWidget::resizeGL(int w, int h) {
         GrRenderTarget* curRenderTarget = fCurContext->wrapBackendRenderTarget(desc);
         SkSafeUnref(fGpuDevice);
         SkSafeUnref(fCanvas);
-        fGpuDevice = new SkGpuDevice(fCurContext, curRenderTarget);
+        fGpuDevice = SkGpuDevice::Create(curRenderTarget);
         fCanvas = new SkCanvas(fGpuDevice);
     }
     fDebugger->resize(w, h);