Start using the third_party/android_tools target for customtabs library

chrome/android/chrome_apk.gyp

Index: chrome/android/chrome_apk.gyp
diff --git a/chrome/android/chrome_apk.gyp b/chrome/android/chrome_apk.gyp
index 636601308b945b40f94a95387489987df51e5fc2..4fa50a2ab0775fac30655b77d67aec53c04cbb96 100644
--- a/chrome/android/chrome_apk.gyp
+++ b/chrome/android/chrome_apk.gyp
@@ -23,20 +23,6 @@
   },
   'targets': [
     {
-      #GN: //chrome/android::custom_tabs_service_aidl
-      'target_name': 'custom_tabs_service_aidl',
-      'type': 'none',
-      'variables': {
-        'aidl_interface_file': 'java/src/android/support/customtabs/common.aidl',
-        'aidl_import_include': 'java/src/android/support/customtabs',
-      },
-      'sources': [
-        'java/src/android/support/customtabs/ICustomTabsCallback.aidl',
-        'java/src/android/support/customtabs/ICustomTabsService.aidl',
-      ],
-      'includes': [ '../../build/java_aidl.gypi' ],
-    },
-    {
       # GN: //chrome/android:chrome_public_template_resources
       'target_name': 'chrome_public_template_resources',
       'type': 'none',