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

android_webview/BUILD.gn

Index: android_webview/BUILD.gn
diff --git a/android_webview/BUILD.gn b/android_webview/BUILD.gn
index 0e7bb13febf83e58e469caba503f87b561875adf..6c7919a58218113621982cdf7abbe5a0688204ff 100644
--- a/android_webview/BUILD.gn
+++ b/android_webview/BUILD.gn
@@ -312,7 +312,8 @@ shared_library("libwebviewchromium") {
   deps = [
     ":webview_entry_point",
   ]
-  configs -= [ "//build/config/android:hide_native_jni_exports" ]
+  configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
+  configs += [ "//build/config/android:hide_all_but_jni" ]
 }
 
 if (android_64bit_target_cpu) {
@@ -334,7 +335,8 @@ if (android_64bit_target_cpu) {
     deps = [
       ":webview_entry_point",
     ]
-    configs -= [ "//build/config/android:hide_native_jni_exports" ]
+    configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
+    configs += [ "//build/config/android:hide_all_but_jni" ]
   }
 }