Remove unneeded JNI registrations.

mojo/mojo_public.gypi

 {
   'targets': [
     {
       'target_name': 'mojo_system',
       'type': 'static_library',
       'defines': [
         'MOJO_SYSTEM_IMPLEMENTATION',
       ],
       'include_dirs': [
         '..',
@@ skipping 33 matching lines @@
           'GLES2_USE_MOJO',
         ],
       },
       'sources': [
         'public/c/gles2/gles2.h',
         'public/c/gles2/gles2_export.h',
         'public/gles2/gles2_private.cc',
         'public/gles2/gles2_private.h',
       ],
       'conditions': [
+        ['OS=="android"', {
+          'ldflags!': [
+            # Remove default export list because this lib has different exports.
+            '-Wl,--version-script="<(android_linker_script)"',
+          ],
+          'ldflags': [
+            # Don't export symbols from statically linked libraries.
+            '-Wl,--exclude-libs=ALL',
+          ],
+        }],
         ['OS=="mac"', {
           'xcode_settings': {
             # Make it a run-path dependent library.
             'DYLIB_INSTALL_NAME_BASE': '@loader_path',
           },
         }],
       ],
     },
     {
       'target_name': 'mojo_test_support',
       'type': 'shared_library',
       'defines': [
         'MOJO_TEST_SUPPORT_IMPLEMENTATION',
       ],
       'include_dirs': [
         '..',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '..',
         ],
       },
       'sources': [
         'public/c/test_support/test_support.h',
         'public/c/test_support/test_support_export.h',
         'public/tests/test_support_private.cc',
         'public/tests/test_support_private.h',
       ],
       'conditions': [
+        ['OS=="android"', {
+          'ldflags!': [
+            # Remove default export list because this lib has different exports.
+            '-Wl,--version-script="<(android_linker_script)"',
+          ],
+          'ldflags': [
+            # Don't export symbols from statically linked libraries.
+            '-Wl,--exclude-libs=ALL',
+          ],
+        }],
         ['OS=="mac"', {
           'xcode_settings': {
             # Make it a run-path dependent library.
             'DYLIB_INSTALL_NAME_BASE': '@loader_path',
           },
         }],
       ],
     },
     {
       'target_name': 'mojo_public_test_utils',
@@ skipping 255 matching lines @@
       ],
       'dependencies': [
         'mojo_shell_bindings',
       ],
       'export_dependent_settings': [
         'mojo_shell_bindings',
       ],
     },
   ],
 }