Generated dart code should import transitive imports.

mojo/dart/packages/_mojo_for_test_only/lib/regression_tests/regression_tests.mojom.dart

Index: mojo/dart/packages/_mojo_for_test_only/lib/regression_tests/regression_tests.mojom.dart
diff --git a/mojo/dart/packages/_mojo_for_test_only/lib/regression_tests/regression_tests.mojom.dart b/mojo/dart/packages/_mojo_for_test_only/lib/regression_tests/regression_tests.mojom.dart
index 5b3c4d895bdac1be70751e9f1665d68015385645..79176663bcf09dc139d04e869286ed3922132f67 100644
--- a/mojo/dart/packages/_mojo_for_test_only/lib/regression_tests/regression_tests.mojom.dart
+++ b/mojo/dart/packages/_mojo_for_test_only/lib/regression_tests/regression_tests.mojom.dart
@@ -3292,7 +3292,7 @@ mojom_types.RuntimeTypeInfo  _initRuntimeTypeInfo() {
   // serializedRuntimeTypeInfo contains the bytes of the Mojo serialization of
   // a mojom_types.RuntimeTypeInfo struct describing the Mojom types in this
   // file. The string contains the base64 encoding of the gzip-compressed bytes.
-  var serializedRuntimeTypeInfo = "H4sIAAAJbogC/+xdT3fbxhEHKDlWbCWR2ziRY9dxnNZR45j6Y8tR7D5HlESZqiRSj6QS+TUtRZOQyIj/ClKpfMtRRx/zEXLMUccee/RH8NFHH3Vrd4lZETvEAgsIBCGqeG/fEuQOsPvb2ZmdndnluGJcY5BPQY6/Z/kIynG5jQtGfkTSRyT9Bt+/gvwt5LdUI09A/jPkv0H+GnIlYmQTkG9Dfgj5EeRvIB8fMvJ5yEuQv4T8FeQjw/B+yBuQf07SdZKyzzbiudX4s0e6tqtrzWa5Xsu1tGarGY1Jlltol7tP0l3bcov5qlZZzDe1LLmN1/arbbpJkr6wpytphT1afjHfaCpPSNmHzuXXtVapXvy+3CrFq43Wi7TWbNRrTU1RHhDar5zpk6Syi/VKpUx/oPWcJemePV291sqXa82YrudfpHaghXdIumlLFy/uasaz/2RfjjYk09L3Cy1S7huSpu3LkwpQAFaS2Xg6GVuLVSptBI3rLvStM/2qZP+y8mv1f2l6IU/Bhjr+WYouuV99rumsfvLvS2s7mq7VCsb7aN/+0ZYuWder+QpjQGf+S598MTs7LdFPGU3/qVzQKAeRck9J+ta+fLtLaUuAcxL5WrGiNRfzlYpWhJv2M76WfI5Bw9PTUfpIkn6l1tL0nXwBPUJyvNLhffIEZYLKQNvy32l6SzsoqYYcpfKVisQttSNv6cc3Q7z8PXinc09/OvqYv391g79P3OGfNz/J30/M8PdHD/j3vZ3l7395jPTFE6RHFvj7l0v8fWKFr9/YOn//OsPX55dnqP4/oPr+g6d/med/Py6CPkL67Fjh9c28wl9MT85B/l+4Eor19S68Lwb3n5D0O5IE6kWx0ssXSfo7SZuU30r1qjap7xfr1XJN0yer9R/rk029YHxo7D+vlAuTZcZuzcnn5VqxXNttTrbfMtn1WkpWNeHC9Ps8aif9/YJJjztdItwUE25t/e6A23PBfGMa6tNrXBh/qOj946iewN7S8wOM97ip7arpPUHx54ITfy5Y98ODc86feQF/zoaMP2OKu3muLH922QuqPb4JxJclAb7XSLpCkvUsWVG+JOm2FZ8KCHA9CwH1zzZJl6n+hvf+G/CZYPYJ2B/HYD9tXzTy/wDwU5dAv16GB7wH9s37PK6MTydUb3w/L9kvVDbQKi2kUmu5bGIl+bTD7/ek+iPKkeJ+KYLp1+t+8WqfyeKt+oT3hySNkrSU2lxYi3cQ/xrmnhJ4c6QYb21A8I74hPfvYbwur6ViWRODUxs7Koc3R4rx3hkQvId8lifEKp/zKE84Uoz37oDgPew/3tMPPePdIcV4lwYE7ws+yxMC2v0ZwqXT7uUJR4rxLg8I3u/4j/fDB7lsabq26wHvDinG+8cBwfuiz3hvUimczXnBmyPFeO8NCN4jPs8HN9tSuEVQcz0f5Egx3pUBwfvdHuBtSGGDwV3ifUKK8a4OCN6XeoA3lcIJb/x9QorxroUc7wm07nciP1RvdvyWAOersJTAexM7/jkHt2MXrk+AB3qN67hgnWvUZHNbrV9hXI9PsS5Ir3kB/W1YQ81oLVuHI27HtwHxpWg9+TDirv2i9WS2Lidu/z1d++c+qZM1Duw6r+vJmiLmj9kA+UNB72f1/pQk6loUMfdp/fCy684iOTkhKSc3ED8fCPqF+s5vMDkpjKKws5/tCXE/X+qzHB0zraWp8H3EVO5wyF6esngdv+Qp85dT7Or7rY28TtQmaW2sVuSgxO253Gd5eqz4I0+nAAOn9jOp2i95OiIxfs12EMbtRHmr7nDbEODG4mwkcOsM4j7qI7f4icbf3JCc/0F2/NHYnj8AjkIQLXAb7fP4G/FpPsPim2zbb5rShHk+4+bqdfzGKOAaNC5u4yz8kuNRsK2c+IgNqLMqh9g1LjkPk40HYHEp1tGonfhNyfDVLnw/OGP2K7NL5oa9zbfmHOIu2hGo3TBbxof3Q86z9o8N+aPnPoO2d7WbN1f7Ni7xPBzH2fRLzn8AvoQqqXV+V7Pkj2sB4OMFB9UlDqoNDmMwVnWBPTIGccL91HcRG33n93hi62BW48k84f7/eHI3nq5AmfM+nq6AXRLW8cTmP0cRf+Y/18HXar2rprPPQ3IbThdffR+iON6Izfq81/E2JaCneyxoKGWewpOr7+Q0ApCFf2MLfFNBrr/SurN16BHBPBvzH4vv4Xf1uN8HFJb49FGIfTJ2hRlj/qoVn0MB3G93lPMdn/6TYN76RUD2zi2kG7Dd8z7E/hi7nhTp/VFe+ZP5UUdUf/yoLP6F343Y8Rs4bFvs6pdoQPzq1s7vVZy/kz+JrX/LupFwPeeU4PZhDJlwOlT5QFm/4vTnJHFl86dMNpZciqWXmF9OFscoIxT0/zcB2f2n9Sdi3Kd8itdvOMTXLm+urWUW0/F40vj+McSESOOPHoDxfzRg+Ed8wv8K6L6V9fV4OrPyXdyE14wb/NEDMP6Pzwj+Xfa1T3qP4czviu/Y/Q7b57vqdTsgOY31HebPMZWv15TqTS5vOMzLVlF8gRiv6KoVXp8HxH9uz0UY66i8ns4b2Dq19SkLNvsDBQS4ntcC4ke8DnWg+jtfkI27ZON5o5Kv5fXl6YfwPTsfxBnHKEeK8fwkNHGX1gwQ9L4+hPf9Gc94G6QY7+shx7tXeuljWB/Fp6gwu9LpuBVcr5sh0UvjSC/Nw/2wS70kwu09aOdebiY3bfJXO+EVBQKM26cB8Z/X83SYnhoOWE/xp/NI6ClEgOv5YZ/01K8CPZVAfNpQO+PITTzmoYOfdi+XIdPdeCpHrFTa7wspYqvm1lcWoRy1W/8ihWvU9lEY76uhk6s8gzC+vikhR1STHLnpuxxZj22Z4hel+oGQYLw/CjneonP0ZPmUHnMUd/deW4btlV4V+RXYeSIO7oSueqX7JLe2Vftxcdr1OKdxsbySzmRBZ31mj1uUlbXCLxPQuHDrN5LFVfUJV+Y/yMQXU8klG31qwpWVtcI1G1Jcg94Xxp/yZ7MvDBXEeP7tjMXVvWZ4DXmLqxP54y6DXn6qtSz57oc+xdGx9k64jJeecvCHkXZykXNhjosOMt6A7W/d017kGrq2Uz4wTpK04od+xRuoyD+o2IwfWb8r47O3qj98xnA0+KwTURb2+PsLAfn/mV4ktd2vtKz56yslPPH3Qek3Jp/4U2lt1uFRQYxj7ozptzcMV4/79JzkfhPhiuu93Sc99wblsu2dc4jHM7U3FPrutPvwGD5jEX9wugGymsfpbMhrNcB5gZvxcz0gfPzQ+3MgnA4c+GlLcv2P7ceTOyVcOTkf3+Mx4134L4csTjaoeEIWl14CYDAuT+FzP+arwz2YrzL/XyLibt1adI4A20drfyq9zblZDoS4PxZCxKfDIeLTRfC7nhX5yeJPfnXJhz8L8GF+UKd/NxDGC8r9LUIX7slzGoftxI+pPshNxYLf2Lof/28V7v/fImz2nqhdwvVMVBD311/PqL3nha9l7L0Maf467FWzGverA2bvmdo7EPYes28aPu3Xwfs5WHy/YBtHF25fKud7v47oHJq7SjD7Pm8h/xzWE6L9Lm7/r0tWT/wvAAD//+WiZkKobgAA";
+  var serializedRuntimeTypeInfo = "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";
 
   // Deserialize RuntimeTypeInfo
   var bytes = BASE64.decode(serializedRuntimeTypeInfo);