Get rid of system_export.h, etc.

mojo/edk/system/BUILD.gn

Index: mojo/edk/system/BUILD.gn
diff --git a/mojo/edk/system/BUILD.gn b/mojo/edk/system/BUILD.gn
index aabeb7574ed216ff68f403d21acf3d5f093147a9..4cb7ad1fb7f8a1fc3c26d79f5f71a21944caba33 100644
--- a/mojo/edk/system/BUILD.gn
+++ b/mojo/edk/system/BUILD.gn
@@ -10,11 +10,8 @@ if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
+# TODO(vtl): Should we get rid of this?

[jamesr, 2015/10/23 23:12:55]

yes?

[viettrungluu, 2015/10/24 00:04:57]

Yeah, but then there's a cascade of things that refers to it (and then the
question of whether we should get rid of them). (If we think that there'll never
need to be config for stuff in the EDK, then we can get rid of them too. But if
we do need config for the EDK, then it'd be slightly annoying to bring back.)

So I might get rid of it as a separate change, which would at least make it
easier to revert.

 config("system_config") {
-  defines = [
-    # Ensures that dependent projects import the core functions on Windows.
-    "MOJO_USE_SYSTEM_IMPL",
-  ]
 }
 
 component("system") {
@@ -120,8 +117,6 @@ component("system") {
     "waiter.h",
   ]
 
-  defines = [ "MOJO_SYSTEM_IMPLEMENTATION" ]
-
   all_dependent_configs = [ ":system_config" ]
 
   public_deps = [