Do not compile zip archiver if nacl is disabled

TBR=benwells@chromium.org
BUG=359837
TEST=Build with target_os="chromeos" and enable_nacl=false.

Change-Id: I17e9bd2a62e4f4e79957e5ae7cc16a9c4248fb21
Reviewed-on: https://chromium-review.googlesource.com/566771
Commit-Queue: Yuki Awano <yawano@chromium.org>
Reviewed-by: Thiemo Nagel <tnagel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485594}

chrome/browser/extensions/BUILD.gn

@@ -986,7 +986,6 @@ static_library("extensions") {
       configs += [ "//build/config/linux/dbus" ]
     }
     deps += [
-      "//chrome/browser/resources/chromeos/zip_archiver",
       "//components/chrome_apps",
       "//components/constrained_window",
       "//components/drive",
@@ -1001,6 +1000,9 @@ static_library("extensions") {
       "//ui/file_manager",
       "//ui/views/",
     ]
+    if (enable_nacl) {
+      deps += [ "//chrome/browser/resources/chromeos/zip_archiver" ]
+    }
   } else {
     sources += [
       "api/easy_unlock_private/easy_unlock_private_crypto_delegate_stub.cc",