fuchsia: base_unittests (mostly) compiling

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 75525aa6e50710e9438b61927cf3aaa3c554d220..5ce764061aace0051ee4ace1ea70c349b0b1b07e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -557,7 +557,7 @@ group("gn_all") {
       deps +=
           [ "//chrome/installer/mini_installer:next_version_mini_installer" ]
     }
-  } else if (!is_android && !is_ios) {
+  } else if (!is_android && !is_ios && !is_fuchsia) {
     deps += [ "//breakpad:symupload($host_toolchain)" ]
   }