[Chromecast] cast_shell_browsertests need chromecast_locales.

cast_shell_browsertests require the chromecsat_locales. These
were getting built implicitly because most builders build
cast_shell before running the tests. The ASAN/MSAN/TSAN builders
do not build cast_shell though. Make the dependency explicit.

BUG=internal b/35627608
TEST=cast_shell_browsertests

Review-Url: https://codereview.chromium.org/2702413003
Cr-Commit-Position: refs/heads/master@{#452221}
diff --git a/chromecast/BUILD.gn b/chromecast/BUILD.gn
index 6e0581f8..aff4184 100644
--- a/chromecast/BUILD.gn
+++ b/chromecast/BUILD.gn
@@ -309,6 +309,10 @@
     "//chromecast/app:test_support",
     "//chromecast/browser:browsertests",
   ]
+
+  data_deps = [
+    ":chromecast_locales_pak",
+  ]
 }
 
 group("cast_shell_lib") {