[Mac] Only enable the CFBundleBlocker in the browser process.

chrome/app/chrome_main_delegate.cc

Index: chrome/app/chrome_main_delegate.cc
diff --git a/chrome/app/chrome_main_delegate.cc b/chrome/app/chrome_main_delegate.cc
index 7cf7a916cbb99ac662aa730bf933dd193c62d9a5..53979037813b3b8e732a2012008885a205e4b553 100644
--- a/chrome/app/chrome_main_delegate.cc
+++ b/chrome/app/chrome_main_delegate.cc
@@ -490,7 +490,11 @@ bool ChromeMainDelegate::BasicStartupComplete(int* exit_code) {
   ObjcEvilDoers::ZombieEnable(true, is_browser ? 10000 : 1000);
 
   SetUpBundleOverrides();
-  chrome::common::mac::EnableCFBundleBlocker();
+
+  // Only enable the CFBundleBlocker in the browser. In child processes,
+  // the sandbox will block access to loadable bundle locations.
+  if (is_browser)
+    chrome::common::mac::EnableCFBundleBlocker();
 #endif
 
   Profiling::ProcessStarted();