Make base_unittests pass in gn/win/asan builds.

build/config/BUILD.gn

Index: build/config/BUILD.gn
diff --git a/build/config/BUILD.gn b/build/config/BUILD.gn
index 6a3133d9ecc6bcd02848a45b4a1803ce15627bf4..872410987bc0e51ea9340949d18bdac4fdaff9d4 100644
--- a/build/config/BUILD.gn
+++ b/build/config/BUILD.gn
@@ -408,6 +408,7 @@ config("executable_config") {
   if (use_locally_built_instrumented_libraries) {
     configs += [ "//third_party/instrumented_libraries:locally_built_ldflags" ]
   }
+  configs += [ "//build/config/sanitizers:asan_link_executable" ]

[Dirk Pranke, 2016/08/03 22:13:19]

nit: can we avoid having "asan" in the names of the configs?

[Nico, 2016/08/03 22:16:42]

Sure, done.

Out of curiosity: WHy? It an asan-specific config; why should asan not be in the
name? Because it could be non-asan-specific in the future?

[Dirk Pranke, 2016/08/03 22:27:34]

Yes, or there might be multiple things that need to be added depending on the
combination of sanitizer flags (asan vs. asan + lsan, etc.) and I don't want to
have to add multiple configs here, just expose a single "sanitizer" config that
does everything internally.

 }
 
 # Shared library configs -------------------------------------------------------
@@ -434,6 +435,7 @@ config("shared_library_config") {
   if (use_locally_built_instrumented_libraries) {
     configs += [ "//third_party/instrumented_libraries:locally_built_ldflags" ]
   }
+  configs += [ "//build/config/sanitizers:asan_link_shared_library" ]
 }
 
 # Add this config to your target to enable precompiled headers.