bluetooth: Populate Web Bluetooth blacklist from variations:: parameter.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 31c8f70af1f6a8d203d2ef405b1615fb23ff6ace..eefdbe0dec7c6fad695f9f757593ec867e8fc994 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -2020,6 +2020,11 @@ ChromeContentBrowserClient::AllowWebBluetooth(
   return AllowWebBluetoothResult::ALLOW;
 }
 
+std::string ChromeContentBrowserClient::GetWebBluetoothBlacklist() {
+  return variations::GetVariationParamValue("WebBluetoothBlacklist",
+                                            "blacklist_additions");
+}
+
 net::URLRequestContext*
 ChromeContentBrowserClient::OverrideRequestContextForURL(
     const GURL& url, content::ResourceContext* context) {