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

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index f0efaa62195113413a88fd403f2228abc3646b2e..f75706a0e2d8d0f8b66a08fc47d34d81ce53a2e6 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -160,19 +160,17 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
       const base::string16& name,
       content::ResourceContext* context,
       const std::vector<std::pair<int, int>>& render_frames) override;
-
 #if defined(ENABLE_WEBRTC)
   bool AllowWebRTCIdentityCache(const GURL& url,
                                 const GURL& first_party_url,
                                 content::ResourceContext* context) override;
 #endif  // defined(ENABLE_WEBRTC)
-
   bool AllowKeygen(const GURL& url, content::ResourceContext* context) override;
   AllowWebBluetoothResult AllowWebBluetooth(
       content::BrowserContext* browser_context,
       const url::Origin& requesting_origin,
       const url::Origin& embedding_origin) override;
-
+  std::string GetWebBluetoothBlacklist() override;
   net::URLRequestContext* OverrideRequestContextForURL(
       const GURL& url,
       content::ResourceContext* context) override;