Add API keys to SafeBrowsing client-side phishing and download verdict requests.

chrome/browser/safe_browsing/download_protection_service.h

Index: chrome/browser/safe_browsing/download_protection_service.h
diff --git a/chrome/browser/safe_browsing/download_protection_service.h b/chrome/browser/safe_browsing/download_protection_service.h
index cf54ca4dfc1d3142372b6674372605827ad1e1dd..9047a3487003fac9085f45773f061ffc0aebeb62 100644
--- a/chrome/browser/safe_browsing/download_protection_service.h
+++ b/chrome/browser/safe_browsing/download_protection_service.h
@@ -178,6 +178,9 @@ class DownloadProtectionService {
       const net::X509Certificate& issuer,
       std::vector<std::string>* whitelist_strings);
 
+  // Returns the URL that will be used for download requests.
+  static std::string GetDownloadRequestUrl();
+
   // This pointer may be NULL if SafeBrowsing is disabled. The
   // SafeBrowsingService owns us, so we don't need to hold a reference to it.
   SafeBrowsingService* sb_service_;