Mojo: Eliminate duplicate C API symbols

mojo/mojo_variables.gypi

-# Copyright 2014 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.
-
-#
-# A set of GYP variables that are shared between various mojo .gyp files.
-#
-{
-  'variables': {
-    'chromium_code': 1,
-    'mojo_shell_debug_url%': "",
-    'conditions': [
-      #
-      # The following mojo_system-prefixed variables are used to express a
-      # dependency on the mojo system APIs.
-      #
-      # In a component == "shared_library" build, everything can link against
-      # mojo_system_impl because it is built as a shared library. However, in a
-      # component != "shared_library" build, mojo_system_impl is linked into an
-      # executable (e.g., mojo_shell), and must be injected into other shared
-      # libraries (i.e., Mojo Apps) that need the mojo system API.
-      #
-      # For component targets, add <(mojo_system_for_component) to your
-      # dependencies section.  For loadable module targets (e.g., a Mojo App),
-      # add <(mojo_system_for_loadable_module) to your dependencies section.
-      #
-      # NOTE: component != "shared_library" implies that we are generating a
-      # static library, and in that case, it is expected that the target
-      # listing the component as a dependency will specify either mojo_system
-      # or mojo_system_impl to link against. This enables multiple targets to
-      # link against the same component library without having to agree on
-      # which Mojo system library they are using.
-      #
-      ['component=="shared_library"', {
-        'mojo_system_for_component': "<(DEPTH)/mojo/mojo_edk.gyp:mojo_system_impl",
-        'mojo_system_for_loadable_module': "<(DEPTH)/mojo/mojo_edk.gyp:mojo_system_impl",
-      }, {
-        'mojo_system_for_component': "<(DEPTH)/mojo/mojo_public.gyp:mojo_system_placeholder",
-        'mojo_system_for_loadable_module': "<(DEPTH)/mojo/mojo_public.gyp:mojo_system",
-      }],
-    ],
-    'mojo_public_system_unittest_sources': [
-      '<(DEPTH)/mojo/public/c/system/tests/core_unittest.cc',
-      '<(DEPTH)/mojo/public/c/system/tests/core_unittest_pure_c.c',
-      '<(DEPTH)/mojo/public/c/system/tests/macros_unittest.cc',
-      '<(DEPTH)/mojo/public/cpp/system/tests/core_unittest.cc',
-      '<(DEPTH)/mojo/public/cpp/system/tests/watcher_unittest.cc',
-    ],
-  },
-}