handoff: Fix the origin so that it correctly reflects the sender.

chrome/browser/app_controller_mac.mm

Index: chrome/browser/app_controller_mac.mm
diff --git a/chrome/browser/app_controller_mac.mm b/chrome/browser/app_controller_mac.mm
index 866f7c009875b50a5bcb09b28ded63f4c8085fff..d77560a3392ca74bf28ad69ab49d631473edde2b 100644
--- a/chrome/browser/app_controller_mac.mm
+++ b/chrome/browser/app_controller_mac.mm
@@ -1672,8 +1672,10 @@ class AppControllerProfileObserver : public ProfileInfoCacheObserver {
   if (![self shouldUseHandoff])
     return;
 
-  if (!handoffManager_)
-    handoffManager_.reset([[HandoffManager alloc] init]);
+  if (!handoffManager_) {
+    handoffManager_.reset(
+        [[HandoffManager alloc] initWithOrigin:handoff::ORIGIN_MAC]);
+  }
 
   GURL handoffURL = [self handoffURLFromWebContents:webContents];
   [self passURLToHandoffManager:handoffURL];