[fuchsia] Add google_apis_unittests to gn_all

The target already builds successfully when directly referenced.

Bug: 1164524
Change-Id: I54c74b87be87069c005bed8416ac307d0eb7a5c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618961
Auto-Submit: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Sharon Yang <yangsharon@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842348}

BUILD.gn

@@ -482,7 +482,7 @@ group("gn_all") {
     }
   }
 
-  if (is_ios || is_win || (is_linux || is_chromeos_lacros)) {
+  if (is_ios || is_win || (is_linux || is_chromeos_lacros) || is_fuchsia) {
     deps += [
       "//base:base_i18n_perftests",
       "//google_apis:google_apis_unittests",