Fix pure virtual call from destructor and turn VertBench back on



git-svn-id: http://skia.googlecode.com/svn/trunk@2556 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrGpuGL.cpp b/src/gpu/GrGpuGL.cpp
index 012fdc1..7865592 100644
--- a/src/gpu/GrGpuGL.cpp
+++ b/src/gpu/GrGpuGL.cpp
@@ -309,6 +309,8 @@
 }
 
 GrGpuGL::~GrGpuGL() {
+    // This must be called by before the GrDrawTarget destructor
+    this->releaseGeometry();
     // This subclass must do this before the base class destructor runs
     // since we will unref the GrGLInterface.
     this->releaseResources();