Don't register JNI methods for the android_webview.

build/jar_file_jni_generator.gypi

Index: build/jar_file_jni_generator.gypi
diff --git a/build/jar_file_jni_generator.gypi b/build/jar_file_jni_generator.gypi
index dc43c49070d2efe5e1372ba2f62ac66a9beaa461..0c989b53e8280ff5e034e66a9a2bb87b80471c5d 100644
--- a/build/jar_file_jni_generator.gypi
+++ b/build/jar_file_jni_generator.gypi
@@ -26,6 +26,7 @@
     'jni_generator_includes%': (
         'base/android/jni_generator/jni_generator_helper.h'
     ),
+    'native_exports%': '',
   },
   'actions': [
     {
@@ -54,6 +55,7 @@
         '<(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,
@@ -62,4 +64,27 @@
   # 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',
+            ],
+          },
+        }],
+      ],
+    }],
+  ],
 }