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The crash is caused by not including the AIDL files from which the
WebApkServiceImpl is inherited in the webapk1.dex. In the build.gn, I move the
dependency of webapk_service_aidl from "deps" to "srcjar_deps", since the
.java files in the latter will be included in webapk1.dex.

BUG=645215

Review-Url: https://codereview.chromium.org/2340853002
Cr-Commit-Position: refs/heads/master@{#419017}