public Builder clearImportCustomRoutes() {
      bitField0_ = (bitField0_ & ~0x00000020);
      importCustomRoutes_ = false;
      onChanged();
      return this;
    }
<pre>
Optional. True if custom routes are imported from the peered network;
false otherwise. The default value is true.
</pre>

<code>optional bool import_custom_routes = 9 [(.google.api.field_behavior) = OPTIONAL];
</code>

@return This builder for chaining.
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/NetworkPeering.java