[chrome_elf] Temporarily still listen to the old beacon.

Don't initialize third_party_dlls if the beacon says not to.

Test: chrome_elf_unittests.exe
Change-Id: I5334d82eb11ecfcc026ed1bfaf25a02070830e59
Reviewed-on: https://chromium-review.googlesource.com/1180267Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Penny MacNeil <pennymac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584227}

chrome_elf/chrome_elf_main.cc

@@ -74,8 +74,8 @@ BOOL APIENTRY DllMain(HMODULE module, DWORD reason, LPVOID reserved) {
       // Initialize blacklist before initializing third_party_dlls.
       // Note: "blacklist" is deprecated in favor of "third_party_dlls", but
       //       beacon management temporarily remains in the blacklist project.
-      blacklist::Initialize(false);  // Don't force, abort if beacon is present.
-      third_party_dlls::Init();
+      if (blacklist::Initialize(false))
+        third_party_dlls::Init();
     } __except (elf_crash::GenerateCrashDump(GetExceptionInformation())) {
     }
   } else if (reason == DLL_PROCESS_DETACH) {