Add a kill switch for all of Web Bluetooth.

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 d3cb2a1e2914333583d8005eef5a1831dabb4b3e..f0efaa62195113413a88fd403f2228abc3646b2e 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -168,9 +168,10 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
 #endif  // defined(ENABLE_WEBRTC)
 
   bool AllowKeygen(const GURL& url, content::ResourceContext* context) override;
-  bool AllowWebBluetooth(content::BrowserContext* browser_context,
-                         const url::Origin& requesting_origin,
-                         const url::Origin& embedding_origin) override;
+  AllowWebBluetoothResult AllowWebBluetooth(
+      content::BrowserContext* browser_context,
+      const url::Origin& requesting_origin,
+      const url::Origin& embedding_origin) override;
 
   net::URLRequestContext* OverrideRequestContextForURL(
       const GURL& url,