Don't compile code for desktop zoom or GuestViews on mobile platforms.

components/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
+import("//extensions/features/features.gni")
 import("//printing/features/features.gni")
 import("//rlz/features/features.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 if (is_ios) {
@@ skipping 135 matching lines @@
     "//components/variations:unit_tests",
     "//components/variations/service:unit_tests",
     "//components/web_resource:unit_tests",
     "//components/webdata/common:unit_tests",
   ]
 
   if (enable_nacl) {
     deps += [ "//components/nacl/browser:unit_tests" ]
   }
 
+  if (enable_extensions) {
+    deps += [ "//components/guest_view/browser:unit_tests" ]
+  }
+
   if (is_ios) {
     deps += [
       "//components/image_fetcher/ios:unit_tests",
       "//components/signin/ios/browser:unit_tests",
       "//components/translate/ios/browser:unit_tests",
     ]
   } else {  # !iOS
     deps += [
       "//components/autofill/content/browser:unit_tests",
       "//components/autofill/content/common:unit_tests",
       "//components/autofill/content/renderer:unit_tests",
       "//components/cast_certificate:unit_tests",
       "//components/certificate_reporting:unit_tests",
       "//components/certificate_transparency:unit_tests",
       "//components/contextual_search:unit_tests",
       "//components/crash/content/app:unit_tests",
       "//components/crash/core/common:unit_tests",
       "//components/data_reduction_proxy/content/browser:unit_tests",
       "//components/data_reduction_proxy/core/browser:unit_tests",
       "//components/data_reduction_proxy/core/common:unit_tests",
       "//components/data_use_measurement/core:unit_tests",
       "//components/discardable_memory/common:unit_tests",
       "//components/discardable_memory/service:unit_tests",
       "//components/dom_distiller/content/browser:unit_tests",
       "//components/domain_reliability:unit_tests",
       "//components/error_page/renderer:unit_tests",
       "//components/favicon/content:unit_tests",
       "//components/gcm_driver/instance_id:unit_tests",
-      "//components/guest_view/browser:unit_tests",
       "//components/history/content/browser:unit_tests",
       "//components/invalidation/impl:unit_tests",
       "//components/keyed_service/content:unit_tests",
       "//components/link_header_util:unit_tests",
       "//components/navigation_interception:unit_tests",
       "//components/network_hints/renderer:unit_tests",
       "//components/offline_pages/content:unit_tests",
       "//components/offline_pages/content/background_loader:unit_tests",
       "//components/offline_pages/core:unit_tests",
       "//components/offline_pages/core/background:unit_tests",
@@ skipping 15 matching lines @@
       "//components/spellcheck/renderer:unit_tests",
       "//components/subresource_filter/content/browser:unit_tests",
       "//components/subresource_filter/content/common:unit_tests",
       "//components/subresource_filter/content/renderer:unit_tests",
       "//components/tracing:unit_tests",
       "//components/visitedlink/test:unit_tests",
       "//components/viz/display_compositor:unit_tests",
       "//components/wallpaper:unit_tests",
       "//components/web_cache/browser:unit_tests",
       "//components/webcrypto:unit_tests",
-      "//components/zoom:unit_tests",
     ]
 
     data_deps = [
       ":components_tests_pak",
       "//third_party/mesa:osmesa",
       "//ui/resources:ui_test_pak",
     ]
   }  # iOS/!iOS
 
   if (is_ios) {
@@ skipping 35 matching lines @@
   }
 
   # Desktop-only deps.
   if (!is_android && !is_ios) {
     deps += [
       "//components/cryptauth:unit_tests",
       "//components/feedback:unit_tests",
       "//components/proximity_auth:unit_tests",
       "//components/storage_monitor:unit_tests",
       "//components/web_modal:unit_tests",
+      "//components/zoom:unit_tests",
     ]
   }
 
   if (enable_rlz_support) {
     deps += [ "//components/rlz:unit_tests" ]
   }
 
   if (is_chromeos) {
     deps += [
       "//components/arc:unit_tests",
@@ skipping 213 matching lines @@
       "//testing/perf",
       "//url",
     ]
 
     if (!is_ios) {
       sources += [ "discardable_memory/common/discardable_shared_memory_heap_perftest.cc" ]
       deps += [ "//components/discardable_memory/common" ]
     }
   }
 }