Make most code on mac compile with enable_web_intents=0

chrome/browser/extensions/platform_app_launcher.cc

Index: chrome/browser/extensions/platform_app_launcher.cc
diff --git a/chrome/browser/extensions/platform_app_launcher.cc b/chrome/browser/extensions/platform_app_launcher.cc
index de6fdee90c690e54421db276ea42aef805db1c56..513e54b3812a1091a78b605e0c5fc9edeb053e5c 100644
--- a/chrome/browser/extensions/platform_app_launcher.cc
+++ b/chrome/browser/extensions/platform_app_launcher.cc
@@ -174,6 +174,7 @@ class PlatformAppPathLauncher
     // TODO(benwells): remove this once we no longer support the "intents"
     // syntax in platform app manifests.
     if (!found_service) {
+#if defined(ENABLE_WEB_INTENTS)
       std::vector<webkit_glue::WebIntentServiceData> services =
           extensions::WebIntentsInfo::GetIntentsServices(extension_);
       for (size_t i = 0; i < services.size(); i++) {
@@ -184,6 +185,7 @@ class PlatformAppPathLauncher
           break;
         }
       }
+#endif
     }
 
     // If this app doesn't have an intent that supports the file, launch with