Attempt to fix Mac ASAN build in GN.

build/config/mac/BUILD.gn

Index: build/config/mac/BUILD.gn
diff --git a/build/config/mac/BUILD.gn b/build/config/mac/BUILD.gn
index 958dea9c4d1a5ca93cc00cd44fc82a42e683b7dd..ad67ab2af6fc297545a6dbb0c93fbf167f2951b3 100644
--- a/build/config/mac/BUILD.gn
+++ b/build/config/mac/BUILD.gn
@@ -6,6 +6,7 @@ import("//build/config/sysroot.gni")
 import("//build/config/ios/ios_sdk.gni")
 import("//build/config/mac/mac_sdk.gni")
 import("//build/config/mac/symbols.gni")
+import("//build/config/sanitizers/sanitizers.gni")
 
 # This is included by reference in the //build/config/compiler config that
 # is applied to all targets. It is here to separate out the logic.
@@ -92,7 +93,7 @@ config("runtime_library") {
 config("mac_dynamic_flags") {
   ldflags = [ "-Wl,-ObjC" ]  # Always load Objective-C categories and classes.
 
-  if (is_component_build) {
+  if (is_component_build || is_asan) {
     ldflags += [
       # Path for loading shared libraries for unbundled binaries.
       "-Wl,-rpath,@loader_path/.",