Fix "unused variable" warnings.

chrome/browser/geolocation/geolocation_permission_context_extensions.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/geolocation/geolocation_permission_context_extensions.h"
 
 #include "base/callback.h"
 
 #if defined(ENABLE_EXTENSIONS)
 #include "chrome/browser/permissions/permission_request_id.h"
 #include "chrome/browser/profiles/profile.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/guest_view/web_view/web_view_permission_helper.h"
 #include "extensions/browser/process_map.h"
 #include "extensions/browser/suggest_permission_util.h"
 #include "extensions/browser/view_type_utils.h"
 #include "extensions/common/extension.h"
 
 using extensions::APIPermission;
 using extensions::ExtensionRegistry;
 #endif
 
 namespace {
 
-#if ENABLE_EXTENSIONS
+#if defined(ENABLE_EXTENSIONS)

[Peter Kasting, 2016/05/19 05:11:37]

I guess this worked before because the compiler treats undefined symbols as 0? 
In any case, using defined() matches every other instance in the codebase.

 void CallbackContentSettingWrapper(
     const base::Callback<void(ContentSetting)>& callback,
     bool allowed) {
   callback.Run(allowed ? CONTENT_SETTING_ALLOW : CONTENT_SETTING_BLOCK);
 }
-#endif // ENABLE_EXTENSIONS
+#endif  // defined(ENABLE_EXTENSIONS)
 
 }  // anonymous namespace
 
-GeolocationPermissionContextExtensions::
-GeolocationPermissionContextExtensions(Profile* profile)
-    : profile_(profile) {
+GeolocationPermissionContextExtensions::GeolocationPermissionContextExtensions(
+    Profile* profile)
+#if defined(ENABLE_EXTENSIONS)
+    : profile_(profile)
+#endif
+{
 }
 
 GeolocationPermissionContextExtensions::
 ~GeolocationPermissionContextExtensions() {
 }
 
 bool GeolocationPermissionContextExtensions::DecidePermission(
     content::WebContents* web_contents,
     const PermissionRequestID& request_id,
     int bridge_id,
@@ skipping 58 matching lines @@
       web_contents ?
       extensions::WebViewPermissionHelper::FromWebContents(web_contents)
       : NULL;
   if (web_view_permission_helper) {
     web_view_permission_helper->CancelGeolocationPermissionRequest(bridge_id);
     return true;
   }
 #endif  // defined(ENABLE_EXTENSIONS)
   return false;
 }