Remove unused third_party dependency

Change-Id: I69397470e3e74a020ad0d6791ea81c4ba609ac00

third_party/chrome/monochrome_public_minimal_apks/chrome_200520.tar.gz.sha1

diff --git a/third_party/chrome/monochrome_public_minimal_apks/chrome_200520.tar.gz.sha1 b/third_party/chrome/monochrome_public_minimal_apks/chrome_200520.tar.gz.sha1
deleted file mode 100644
index a4d4e8f..0000000
--- a/third_party/chrome/monochrome_public_minimal_apks/chrome_200520.tar.gz.sha1
+++ /dev/null
@@ -1 +0,0 @@
-4a9de4ba961c2f0c953c0a88675f29959e8602a7
\ No newline at end of file