Refactor/cleanup WebRTC-specific Andorid glue code.

build/all.gyp

Index: build/all.gyp
diff --git a/build/all.gyp b/build/all.gyp
index 833c3dd5c99d9da5fa3e988527dbf17c6b064d82..6bb6a864fc8ec9191dc4792a457e3e7ce45b130d 100644
--- a/build/all.gyp
+++ b/build/all.gyp
@@ -802,24 +802,6 @@
           ],
         },
         {
-          # WebRTC Android APK tests.
-          'target_name': 'android_builder_webrtc',
-          'type': 'none',
-          'variables': {
-            # Set default value for include_tests to '0'. It is normally only
-            # used in WebRTC GYP files. It is set to '1' only when building
-            # WebRTC for Android, inside a Chromium checkout.
-            'include_tests%': 0,
-          },
-          'conditions': [
-            ['include_tests==1', {
-              'dependencies': [
-                '../third_party/webrtc/build/apk_tests.gyp:*',
-              ],
-            }],
-          ],
-        },  # target_name: android_builder_webrtc
-        {
           # WebRTC Chromium tests to run on Android.
           'target_name': 'android_builder_chromium_webrtc',
           'type': 'none',