Update mojo sdk to rev f6c8ec07c01deebc13178d516225fd12695c3dc2

mojo/public/c/system/BUILD.gn

 # 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.
 
+import("../../mojo_sdk.gni")
+
 # Depend on this target to use the types etc defined in the system without
 # linking against a specific implementation of the system. To link against a
 # particular implementation, use the :for_component or
 # :for_shared_library targets, depending on the type of target you are.
-source_set("system") {
+mojo_sdk_source_set("system") {
   sources = [
     "buffer.h",
     "core.h",
     "data_pipe.h",
     "functions.h",
     "macros.h",
     "message_pipe.h",
     "system_export.h",
     "types.h",
   ]
 }
 
 # In an is_component_build build, everything can link against //mojo/edk/system
 # because it is built as a shared library. However, in a static build,
 # //mojo/edk/system 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/public/c/system:for_component to your deps
 # section.
 #
 # For shared_library targets (e.g., a Mojo App), add
 # //mojo/public/c/system:for_shared_library to your deps
 
+# TODO(jamesr): Eliminate the need for these targets. crbug.com/438701
 group("for_shared_library") {
   public_deps = [
     ":system",
   ]
   if (is_component_build) {
     deps = [
-      "//mojo/edk/system",
+      "../../../edk/system",
     ]
   } else {
     deps = [
-      "//mojo/public/platform/native:system_thunks",
+      "../../platform/native:system_thunks",
     ]
   }
 }
 
 group("for_component") {
   public_deps = [
     ":system",
   ]
   if (is_component_build) {
     deps = [
-      "//mojo/edk/system",
+      "../../../edk/system",
     ]
   }
 }