[WebGL] avoid 'forceContextLost' notifications during destruction

GraphicsContextGLANGLE::reshape(0, 0) may trigger `forceContextLost`
if it fails to reshape FBOs. If it happens during HTMLCanvasElement
destruction it will capture areference to an HTMLCanvasElement that is
being destroyed, and lead to a double destruction of HTMLCanvasElement
and random crashes.

Author: emutavchi

Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp

@@ -700,9 +700,9 @@ void WebGLRenderingContextBase::destroyGraphicsContextGL()
     removeActivityStateChangeObserver();
 
     if (m_context) {
-        // first release the big textures allocated for the FBOs
-        m_context->reshape(0,0);
         m_context->setClient(nullptr);
+        // release the big textures allocated for the FBOs
+        m_context->reshape(0,0);
         m_context = nullptr;
         removeActiveContext(*this);
     }