Move //mojo/shell to //shell

mojo/android/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/android/rules.gni")
 
 group("android") {
   testonly = true
   deps = [
     ":system_java",
     ":mojo_javatests",
     ":mojo_test_apk",
   ]
 }
 
 generate_jni("jni_headers") {
   sources = [
     "javatests/src/org/chromium/mojo/MojoTestCase.java",
     "javatests/src/org/chromium/mojo/bindings/ValidationTestUtil.java",
     "../../services/native_viewport/android/src/org/chromium/mojo/PlatformViewportAndroid.java",
-    "../shell/android/apk/src/org/chromium/mojo_shell_apk/MojoMain.java",
+    "../../shell/android/apk/src/org/chromium/mojo_shell_apk/MojoMain.java",
   ]
   deps = [
     ":system_java_jni_headers",
   ]
 
   jni_package = "mojo"
 }
 
 generate_jni("system_java_jni_headers") {
   sources = [
@@ skipping 102 matching lines @@
     ":mojo_java_unittests",
     ":system_java",
     "//base:base_java",
     "//mojo/public/java:bindings",
     "//mojo/public/interfaces/bindings/tests:test_interfaces",
   ]
   native_libs = [ "libmojo_java_unittests.so" ]
   apk_name = "MojoTest"
   android_manifest = "javatests/AndroidManifest.xml"
 }