Mojo: Implement MojoUnmapBuffer().

Still to do: more tests.

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Review URL: https://codereview.chromium.org/220113003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260832 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/mojo/mojo.gyp b/mojo/mojo.gyp
index 4c24e47d..ee5ec8b 100644
--- a/mojo/mojo.gyp
+++ b/mojo/mojo.gyp
@@ -132,6 +132,8 @@
         'system/local_data_pipe.h',
         'system/local_message_pipe_endpoint.cc',
         'system/local_message_pipe_endpoint.h',
+        'system/mapping_table.cc',
+        'system/mapping_table.h',
         'system/memory.cc',
         'system/memory.h',
         'system/message_in_transit.cc',