Remove directory dependency to pyproto/google

Dependency to pyproto/google is not necessary.

Derived from
https://chromium-review.googlesource.com/c/chromium/src/+/1167146#message-049697492df0c7c238cbe48e28b45ad9b677fb94

Change-Id: I4701c6ed01f9ec656a737d55623a17cff4160a03
Reviewed-on: https://chromium-review.googlesource.com/1167342Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Nick Harper <nharper@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582689}

components/sync/BUILD.gn

@@ -931,7 +931,6 @@ source_set("unit_tests") {
     "//third_party/pyftpdlib/",
     "//third_party/pywebsocket/src/mod_pywebsocket/",
     "//third_party/tlslite/",
-    "$root_out_dir/pyproto/google/",
   ]
 
   deps = [

net/BUILD.gn

@@ -5263,7 +5263,6 @@ test("net_unittests") {
       "//third_party/pyftpdlib/",
       "//third_party/pywebsocket/src/mod_pywebsocket/",
       "//third_party/tlslite/",
-      "$root_out_dir/pyproto/google/",
     ]
   }