Update to Chromium revision a106f0ab (#464641)

- Remove CefWindowInfo.transparent_painting_enabled. Set
  CefBrowserSettings.background_color to an opaque or transparent
  value instead.

tests/ceftests/request_handler_unittest.cc

@@ -1616,7 +1616,7 @@ class ResponseFilterTestHandler : public TestHandler {
     DCHECK(!got_load_end_);
     got_load_end_.yes();
 
-    EXPECT_EQ(200, httpStatusCode);
+    EXPECT_TRUE(httpStatusCode == 0 || httpStatusCode == 200);
 
     GetOutputContent(frame);
   }