Add missing dependency on test_support.

sandboxed_zip_analyzer_unittest.cc uses test_utils.h which depends on
browser mojom bindings. Add this dependency to resolve build errors.

Bug: 1012304
Change-Id: I10b39b3b658eb07c253bf25dc60794fe784c9691
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847876
Auto-Submit: Robert Flack <flackr@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#703839}

chrome/services/file_util/public/cpp/BUILD.gn

@@ -43,6 +43,7 @@ if (safe_browsing_mode == 1) {
     deps = [
       ":cpp",
       "//chrome/services/file_util",
+      "//content/test:test_support",
       "//crypto:platform",
       "//skia",
       "//testing/gmock",