Don't register JNI methods for the android_webview.

build/jar_file_jni_generator.gypi

 # Copyright (c) 2012 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.
 
 # This file is meant to be included into a target to provide a rule
 # to generate jni bindings for system Java-files in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'android_jar_jni_headers',
 #   'type': 'none',
 #   'variables': {
 #     'jni_gen_package': 'chrome',
 #     'input_java_class': 'java/io/InputStream.class',
 #   },
 #   'includes': [ '../build/jar_file_jni_generator.gypi' ],
 # },
 #
 # Optional variables:
 #  input_jar_file - The input jar file, if omitted, android_sdk_jar will be used.
 
 {
   'variables': {
     'jni_generator': '<(DEPTH)/base/android/jni_generator/jni_generator.py',
     # A comma separated string of include files.
     'jni_generator_includes%': (
         'base/android/jni_generator/jni_generator_helper.h'
     ),
+    'native_exports%': '',
   },
   'actions': [
     {
       'action_name': 'generate_jni_headers_from_jar_file',
       'inputs': [
         '<(jni_generator)',
         '<(input_jar_file)',
         '<(android_sdk_jar)',
       ],
       'variables': {
         'java_class_name': '<!(basename <(input_java_class)|sed "s/\.class//")',
         'input_jar_file%': '<(android_sdk_jar)'
       },
       'outputs': [
         '<(SHARED_INTERMEDIATE_DIR)/<(jni_gen_package)/jni/<(java_class_name)_jni.h',
       ],
       'action': [
         '<(jni_generator)',
         '-j',
         '<(input_jar_file)',
         '--input_file',
         '<(input_java_class)',
         '--output_dir',
         '<(SHARED_INTERMEDIATE_DIR)/<(jni_gen_package)/jni',
         '--includes',
         '<(jni_generator_includes)',
         '--optimize_generation',
         '<(optimize_jni_generation)',
+        '<(native_exports)',
       ],
       'message': 'Generating JNI bindings from  <(input_jar_file)/<(input_java_class)',
       'process_outputs_as_sources': 1,
     },
   ],
   # This target exports a hard dependency because it generates header
   # files.
   'hard_dependency': 1,
+  'conditions': [
+    ['android_webview_build==1', {
+      'variables': {
+        'native_exports%': '--native_exports',
+      },
+      'dependencies': [
+        '<(DEPTH)/build/linker_script_copy.gyp:linker_script_copy',
+      ],
+      'conditions': [
+        ['component=="static_library"', {
+          'link_settings': {
+            'ldflags': [
+              # Only export symbols that are specified in version script.
+              '-Wl,--version-script=<(android_linker_script)',
+            ],
+            'ldflags!': [
+              '-Wl,--exclude-libs=ALL',
+            ],
+          },
+        }],
+      ],
+    }],
+  ],
 }