Stop linking in desktop/main.cc into the Android build.

shell/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/ui.gni")
 import("//mojo/public/mojo.gni")
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//mojo/tools/embed/rules.gni")
 import("//testing/test.gni")
@@ skipping 31 matching lines @@
   ]
 }
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 if (!mojo_use_prebuilt_mojo_shell) {
   executable("mojo_shell") {
-    sources = [
-      "desktop/main.cc",
-    ]
+    sources = []
 
     deps = [
       ":init",
       ":lib",
       "//base",
       "//build/config/sanitizers:deps",
       "//mojo/common",
       "//mojo/environment:chromium",
     ]
 
-    if (is_android) {
+    if (!is_android) {
+      sources += [ "desktop/main.cc" ]
+    } else {
       sources += [
         "android/library_loader.cc",
         "android/main.cc",
         "android/main.h",
       ]
 
       # On android, the executable is also the native library used by the apk.
       # It means dynamic symbols must be preserved and exported.
       ldflags = [ "-Wl,--export-dynamic" ]
 
@@ skipping 476 matching lines @@
     "//mojo/public/cpp/system:system",
     "//mojo/services/http_server/public/cpp",
     "//mojo/services/http_server/public/interfaces",
     "//mojo/services/network/public/interfaces",
     "//shell/test:bindings",
     ":embed_pingable",
   ]
 
   data_deps = [ "//services/http_server:http_server($default_toolchain)" ]
 }