Fix out of order destruction error

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
===================================================================
--- src/gpu/GrContext.cpp	(revision 11887)
+++ src/gpu/GrContext.cpp	(working copy)
@@ -157,16 +157,16 @@
 }
 
 GrContext::~GrContext() {
-    for (int i = 0; i < fCleanUpData.count(); ++i) {
-        (*fCleanUpData[i].fFunc)(this, fCleanUpData[i].fInfo);
-    }
-
     if (NULL == fGpu) {
         return;
     }
 
     this->flush();
 
+    for (int i = 0; i < fCleanUpData.count(); ++i) {
+        (*fCleanUpData[i].fFunc)(this, fCleanUpData[i].fInfo);
+    }
+
     // Since the gpu can hold scratch textures, give it a chance to let go
     // of them before freeing the texture cache
     fGpu->purgeResources();