trace_processor: Make randomness deterministic

Turn off seeding sqlite randomness /dev/urandom.
In the browser this causes a crash as /dev/urandom is not implemented.

Change-Id: I3986efc0d4b136b646720cdbb7109fc028910f34
diff --git a/buildtools/BUILD.gn b/buildtools/BUILD.gn
index 9a16d42..33203c9 100644
--- a/buildtools/BUILD.gn
+++ b/buildtools/BUILD.gn
@@ -597,6 +597,7 @@
     "-DSQLITE_CORE",
     "-DSQLITE_TEMP_STORE=3",
     "-DSQLITE_OMIT_LOAD_EXTENSION",
+    "-DSQLITE_OMIT_RANDOMNESS",
   ]
 }