Fix aec3_fuzzer chromium build config.

Dependencies need to use relative paths in order to work in Chromium,
see [1].

[1] - https://ci.chromium.org/p/chromium/builders/try/linux-libfuzzer-asan-rel/334174

TBR: saza@webrtc.org
Bug: None
Change-Id: I50c401e5983fbb501d1da2ad909198261a8cb940
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/161300
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30000}
diff --git a/test/fuzzers/BUILD.gn b/test/fuzzers/BUILD.gn
index ce55935..068254d 100644
--- a/test/fuzzers/BUILD.gn
+++ b/test/fuzzers/BUILD.gn
@@ -538,9 +538,9 @@
   ]
   deps = [
     ":fuzz_data_helper",
+    "../../modules/audio_processing:api",
     "../../modules/audio_processing:audio_buffer",
     "../../modules/audio_processing/aec3",
-    "//modules/audio_processing:api",
   ]
 }