Mojo: Implement MojoUnmapBuffer().

mojo/public/c/system/tests/core_unittest.cc

 // Copyright 2013 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 tests the C API.
 
 #include "mojo/public/c/system/core.h"
 
 #include <string.h>
 
@@ skipping 233 matching lines @@
   EXPECT_EQ(MOJO_RESULT_OK, MojoDuplicateBufferHandle(h0, NULL, &h1));
   EXPECT_NE(h1, MOJO_HANDLE_INVALID);
 
   // Close |h0|.
   EXPECT_EQ(MOJO_RESULT_OK, MojoClose(h0));
 
   // The mapping should still be good.
   static_cast<char*>(pointer)[51] = 'y';
 
   // Unmap it.
-  // TODO(vtl): Not yet implemented.
-  EXPECT_EQ(MOJO_RESULT_UNIMPLEMENTED, MojoUnmapBuffer(pointer));
+  EXPECT_EQ(MOJO_RESULT_OK, MojoUnmapBuffer(pointer));
 
   // Map half of |h1|.
   pointer = NULL;
   EXPECT_EQ(MOJO_RESULT_OK,
             MojoMapBuffer(h1, 50, 50, &pointer, MOJO_MAP_BUFFER_FLAG_NONE));
   ASSERT_TRUE(pointer);
 
   // It should have what we wrote.
   EXPECT_EQ('x', static_cast<char*>(pointer)[0]);
   EXPECT_EQ('y', static_cast<char*>(pointer)[1]);
 
   // Unmap it.
-  // TODO(vtl): Not yet implemented.
-  EXPECT_EQ(MOJO_RESULT_UNIMPLEMENTED, MojoUnmapBuffer(pointer));
+  EXPECT_EQ(MOJO_RESULT_OK, MojoUnmapBuffer(pointer));
 
   EXPECT_EQ(MOJO_RESULT_OK, MojoClose(h1));
 }
 
 // Defined in core_unittest_pure_c.c.
 extern "C" const char* MinimalCTest(void);
 
 // This checks that things actually work in C (not C++).
 TEST(CoreTest, MinimalCTest) {
   const char* failure = MinimalCTest();
   EXPECT_TRUE(failure == NULL) << failure;
 }
 
 // TODO(vtl): Add multi-threaded tests.
 
 }  // namespace
 }  // namespace mojo