updated architecture file.

Change-Id: Iaef920c5d518726aeeaf733f34fa6248d02cf611
diff --git a/doc/web/google_app_engine_architecture.png b/doc/web/google_app_engine_architecture.png
index 276faf3..a81a019 100644
--- a/doc/web/google_app_engine_architecture.png
+++ b/doc/web/google_app_engine_architecture.png
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