Reland of Android: Use linker script to hide all non-JNI symbols

components/cronet/android/only_jni_exports.lst

Index: components/cronet/android/only_jni_exports.lst
diff --git a/components/cronet/android/only_jni_exports.lst b/components/cronet/android/only_jni_exports.lst
deleted file mode 100644
index 322201c3eac9969ad5b06924be7087ef76fd3ebe..0000000000000000000000000000000000000000
--- a/components/cronet/android/only_jni_exports.lst
+++ /dev/null
@@ -1,10 +0,0 @@
-# Copyright 2016 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.
-
-{
-  /* Make sure we don't export anything unneeded as it could cause conflicts
-     with symbols from embedders. */
-  global: JNI_OnLoad;
-  local: *;
-};