test_browser.py; Remove duplicate copy of post_manual_reftest. NFC

Author: sbc100

tests/test_browser.py

@@ -3140,29 +3140,8 @@ def test_sdl2_image_prepare_data(self):
 
   @requires_graphics_hardware
   def test_sdl2_canvas_proxy(self):
-    def post():
-      html = read_file('test.html')
-      html = html.replace('</body>', '''
-<script>
-function assert(x, y) { if (!x) throw 'assertion failed ' + y }
-
-%s
-
-var windowClose = window.close;
-window.close = function() {
-  // wait for rafs to arrive and the screen to update before reftesting
-  setTimeout(function() {
-    doReftest();
-    setTimeout(windowClose, 5000);
-  }, 1000);
-};
-</script>
-</body>''' % read_file('reftest.js'))
-      create_file('test.html', html)
-
     create_file('data.txt', 'datum')
-
-    self.btest('sdl2_canvas_proxy.c', reference='sdl2_canvas.png', args=['-sUSE_SDL=2', '--proxy-to-worker', '--preload-file', 'data.txt', '-sGL_TESTING'], manual_reference=True, post_build=post)
+    self.btest('sdl2_canvas_proxy.c', reference='sdl2_canvas.png', args=['-sUSE_SDL=2', '--proxy-to-worker', '--preload-file', 'data.txt', '-sGL_TESTING'], manual_reference=True, post_build=self.post_manual_reftest)
 
   def test_sdl2_pumpevents(self):
     # key events should be detected using SDL_PumpEvents