Remove unneeded JNI registrations.

mojo/mojo_public.gypi

 {
   'targets': [
     {
       'target_name': 'mojo_system',
       'type': '<(component)',
       'defines': [
         'MOJO_SYSTEM_IMPLEMENTATION',
       ],
       'include_dirs': [
         '..',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '..',
         ],
       },
       'sources': [
         'public/c/system/async_waiter.h',
         'public/c/system/core.h',
         'public/c/system/macros.h',
         'public/c/system/system_export.h',
         'public/system/core_private.cc',
         'public/system/core_private.h',
       ],
       'conditions': [
+        ['OS=="android"', {
+          'ldflags!': [
+            # Remove default export list because this lib has different exports.
+            '-Wl,--version-script="../../build/android/android_exports.lst"',
+          ],
+          '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': '@rpath',
           },
           'direct_dependent_settings': {
             'xcode_settings': {
               # Look for run-path dependent libraries in the loader's directory.
               'LD_RUNPATH_SEARCH_PATHS': [ '@loader_path/.', ],
             },
@@ skipping 22 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="../../build/android/android_exports.lst"',
+          ],
+          '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': '@rpath',
           },
           'direct_dependent_settings': {
             'xcode_settings': {
               # Look for run-path dependent libraries in the loader's directory.
               'LD_RUNPATH_SEARCH_PATHS': [ '@loader_path/.', ],
             },
@@ skipping 15 matching lines @@
           '..',
         ],
       },
       '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="../../build/android/android_exports.lst"',
+          ],
+          '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': '@rpath',
           },
           'direct_dependent_settings': {
             'xcode_settings': {
               # Look for run-path dependent libraries in the loader's directory.
               'LD_RUNPATH_SEARCH_PATHS': [ '@loader_path/.', ],
             },
@@ skipping 270 matching lines @@
       ],
       'dependencies': [
         'mojo_shell_bindings',
       ],
       'export_dependent_settings': [
         'mojo_shell_bindings',
       ],
     },
   ],
 }