Fix GN generation for WinASAN build

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 8bf24cc9db7cd7eb26121c8bb2606070fb0ca382..90d164322b2d744b493d872eb22ea01a484d897f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -109,9 +109,13 @@ if (is_win) {
       "//courgette:copy_courgette_binaries",
       "//remoting/webapp",
     ]
-    if (target_cpu == "x86") {
-      deps += [ "//courgette(//build/toolchain/win:x64)" ]
 
+    if (target_cpu == "x86") {
+      if (is_clang) {
+        deps += [ "//courgette(//build/toolchain/win:clang_x64)" ]
+      } else {
+        deps += [ "//courgette(//build/toolchain/win:x64)" ]

[chrisha, 2016/07/28 15:29:57]

I'm not 100% up on how to do things in GN. Does it make sense to have
conditional logic related to courgette in THIS build file? Or should Courgette's
GN file have the appropriate logic gated on 'is_clang'?

[etienneb, 2016/07/28 15:35:39]

I was expecting a cleaner way to do this:

  deps += [ "//courgette($host_compiler)" ]

But, I'm not convince what is the clean way. I hope brettw@ has some inside for
me.

But, I agree... is_clang here is working, but doesn't sound clean.

+      }
       if (is_chrome_branded) {
         deps += [ "//remoting/host:remoting_host_installation" ]
       }