components: Update GN build files for crx_file.

This adds BUILD.gn files for crx_file component. This was overlooked when I originally created the crx_file component.

BUG=371463
[email protected]

Review URL: https://codereview.chromium.org/483683004

Cr-Commit-Position: refs/heads/master@{#290455}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290455 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 47c2d15..59927069 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -45,6 +45,7 @@
     "//components/captive_portal",
     "//components/cloud_devices/common",
     "//components/content_settings/core/common",
+    "//components/crx_file",
     "//components/data_reduction_proxy/browser",
     "//components/domain_reliability",
     "//components/favicon_base",