Don't cross-compile tools used for creating diff installers.

Diff installer creation runs on the same hosts that the build runs on,
so should create binaries for the same architecture.

BUG=1119472
R=mark@chromium.org, thakis@chromium.org

Change-Id: I58772ce20b47cf9ce854a095de3aac3cf697d5ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454390
Commit-Queue: Michael Moss <mmoss@chromium.org>
Auto-Submit: Michael Moss <mmoss@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814475}

chrome/installer/mac/BUILD.gn

@@ -60,19 +60,22 @@ copy("copies") {
   deps = [
     ":copy_signing",
     "//chrome:entitlements",
-    "//chrome/installer/mac/third_party/bsdiff:goobsdiff",
+    "//chrome/installer/mac/third_party/bsdiff:goobsdiff($host_toolchain)",
     "//chrome/installer/mac/third_party/bsdiff:goobspatch",
     "//chrome/installer/mac/third_party/xz:lzma_decompress",
-    "//chrome/installer/mac/third_party/xz:xz",
+    "//chrome/installer/mac/third_party/xz:xz($host_toolchain)",
     "//chrome/installer/mac/third_party/xz:xzdec",
   ]
 
   sources = [
     "$root_gen_dir/chrome/app-entitlements.plist",
-    "$root_out_dir/goobsdiff",
+    get_label_info(
+            "//chrome/installer/mac/third_party/bsdiff:goobsdiff($host_toolchain)",
+            "root_out_dir") + "/goobsdiff",
     "$root_out_dir/goobspatch",
     "$root_out_dir/liblzma_decompress.dylib",
-    "$root_out_dir/xz",
+    get_label_info("//chrome/installer/mac/third_party/xz:xz($host_toolchain)",
+                   "root_out_dir") + "/xz",
     "$root_out_dir/xzdec",
     "//chrome/app/helper-gpu-entitlements.plist",
     "//chrome/app/helper-plugin-entitlements.plist",