[libFuzzer] Depend directly on //base to fix build failure.

Builds started failing because //base was only depended on
implicitly.

TBR=googleo

Change-Id: I1b020d169cf092cbd1e6050a9512a3c818c24bb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865474Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Auto-Submit: Jonathan Metzman <metzman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706622}

chromeos/services/ime/public/cpp/BUILD.gn

@@ -124,6 +124,7 @@ if (use_libfuzzer) {
     deps = [
       ":rulebased",
       ":rulebased_fuzzer_proto",
+      "//base",
       "//third_party/libprotobuf-mutator",
     ]
   }