Remove unused ContentBrowserClient::IsURLAcceptableForWebUI API

This API is no longer used and the bug it references is closed.

Bug: 768526
Change-Id: I6570ce4531c7cccd47ab21e26ad7d570d10e6c8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2091939
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748355}

content/browser/webui/web_ui_controller_factory_registry.cc

@@ -99,17 +99,11 @@ bool WebUIControllerFactoryRegistry::IsURLAcceptableForWebUI(
          // See http://crbug.com/42547
          url.spec() == url::kAboutBlankURL ||
          // javascript: and debug URLs like chrome://kill are allowed.
-         IsRendererDebugURL(url) ||
-         // Temporarily allow the embedder to whitelist URLs allowed in WebUI
-         // until crbug.com/768526 is resolved.
-         GetContentClient()->browser()->IsURLAcceptableForWebUI(browser_context,
-                                                                url);
+         IsRendererDebugURL(url);
 }
 
-WebUIControllerFactoryRegistry::WebUIControllerFactoryRegistry() {
-}
+WebUIControllerFactoryRegistry::WebUIControllerFactoryRegistry() = default;
 
-WebUIControllerFactoryRegistry::~WebUIControllerFactoryRegistry() {
-}
+WebUIControllerFactoryRegistry::~WebUIControllerFactoryRegistry() = default;
 
 }  // namespace content

content/public/browser/content_browser_client.cc

@@ -184,13 +184,6 @@ bool ContentBrowserClient::CanCommitURL(RenderProcessHost* process_host,
   return true;
 }
 
-bool ContentBrowserClient::IsURLAcceptableForWebUI(
-    BrowserContext* browser_context,
-    const GURL& url) {
-  DCHECK(browser_context);
-  return false;
-}
-
 bool ContentBrowserClient::ShouldStayInParentProcessForNTP(
     const GURL& url,
     SiteInstance* parent_site_instance) {

content/public/browser/content_browser_client.h

@@ -430,12 +430,6 @@ class CONTENT_EXPORT ContentBrowserClient {
   // This is called on the UI thread.
   virtual bool CanCommitURL(RenderProcessHost* process_host, const GURL& url);
 
-  // Returns whether a URL can be displayed within a WebUI for a given
-  // BrowserContext. Temporary workaround while crbug.com/768526 is resolved.
-  // Note: This is used by an internal Cast implementation of this class.
-  virtual bool IsURLAcceptableForWebUI(BrowserContext* browser_context,
-                                       const GURL& url);
-
   // Allows the embedder to override parameters when navigating. Called for both
   // opening new URLs and when transferring URLs across processes.
   virtual void OverrideNavigationParams(