Remove custom chrome scheme handling (see #3685)

- Add CEF info to existing chrome://version WebUI.
- Move chrome://license handling to WebUI.
- Remove chrome://webui-hosts; use chrome://chrome-urls instead.
- Remove chrome://extension-support; navigate to docs directly instead.

Author: magreenblatt

BUILD.gn

@@ -601,8 +601,6 @@ source_set("libcef_static") {
     "libcef/browser/native/window_delegate_view.h",
     "libcef/browser/navigation_entry_impl.cc",
     "libcef/browser/navigation_entry_impl.h",
-    "libcef/browser/net/chrome_scheme_handler.cc",
-    "libcef/browser/net/chrome_scheme_handler.h",
     "libcef/browser/net/crlset_file_util_impl.cc",
     "libcef/browser/net/throttle_handler.cc",
     "libcef/browser/net/throttle_handler.h",

libcef/browser/chrome/chrome_browser_main_extra_parts_cef.cc

@@ -10,7 +10,6 @@
 #include "cef/libcef/browser/chrome/chrome_startup_browser_creator.h"
 #include "cef/libcef/browser/context.h"
 #include "cef/libcef/browser/file_dialog_runner.h"
-#include "cef/libcef/browser/net/chrome_scheme_handler.h"
 #include "cef/libcef/browser/permission_prompt.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/views/chrome_constrained_window_views_client.h"
@@ -68,7 +67,6 @@ void ChromeBrowserMainExtraPartsCef::PreMainMessageLoopRun() {
       {base::TaskPriority::USER_BLOCKING,
        base::TaskShutdownBehavior::BLOCK_SHUTDOWN, base::MayBlock()});
 
-  scheme::RegisterWebUIControllerFactory();
   context_menu::RegisterCallbacks();
   file_dialog_runner::RegisterFactory();
   permission_prompt::RegisterCreateCallback();

libcef/browser/chrome/chrome_content_browser_client_cef.cc

@@ -16,7 +16,6 @@
 #include "cef/libcef/browser/certificate_query.h"
 #include "cef/libcef/browser/chrome/chrome_browser_main_extra_parts_cef.h"
 #include "cef/libcef/browser/context.h"
-#include "cef/libcef/browser/net/chrome_scheme_handler.h"
 #include "cef/libcef/browser/net/throttle_handler.h"
 #include "cef/libcef/browser/net_service/cookie_manager_impl.h"
 #include "cef/libcef/browser/net_service/login_delegate.h"
@@ -466,18 +465,6 @@ ChromeContentBrowserClientCef::CreateLoginDelegate(
       std::move(auth_required_callback));
 }
 
-void ChromeContentBrowserClientCef::BrowserURLHandlerCreated(
-    content::BrowserURLHandler* handler) {
-  // Register the Chrome handlers first for proper URL rewriting.
-  ChromeContentBrowserClient::BrowserURLHandlerCreated(handler);
-  scheme::BrowserURLHandlerCreated(handler);
-}
-
-bool ChromeContentBrowserClientCef::IsWebUIAllowedToMakeNetworkRequests(
-    const url::Origin& origin) {
-  return scheme::IsWebUIAllowedToMakeNetworkRequests(origin);
-}
-
 void ChromeContentBrowserClientCef::ExposeInterfacesToRenderer(
     service_manager::BinderRegistry* registry,
     blink::AssociatedInterfaceRegistry* associated_registry,

libcef/browser/chrome/chrome_content_browser_client_cef.h

@@ -121,8 +121,6 @@ class ChromeContentBrowserClientCef : public ChromeContentBrowserClient {
       scoped_refptr<net::HttpResponseHeaders> response_headers,
       bool first_auth_attempt,
       LoginAuthRequiredCallback auth_required_callback) override;
-  void BrowserURLHandlerCreated(content::BrowserURLHandler* handler) override;
-  bool IsWebUIAllowedToMakeNetworkRequests(const url::Origin& origin) override;
   void ExposeInterfacesToRenderer(
       service_manager::BinderRegistry* registry,
       blink::AssociatedInterfaceRegistry* associated_registry,