Remove file and data URL support from Chromecast's URLRequestContext.

The URLRequestContext is only being used by one internal legacy
consumer, which doesn't need either file or data URL support. We'll want
to remove the URLRequestContext when we can, but for now, removing these
two factories will let us remove the code in net/ to handle those two
types of URLs, as they're not handled by the network service.

Bug: 934009
Change-Id: I753f03bcc6e9f915cb64490d9bee9a8664a90695
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787401Reviewed-by: Junbo Ke <juke@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693847}

chromecast/browser/url_request_context_factory.cc

@@ -39,8 +39,6 @@
 #include "net/http/http_stream_factory.h"
 #include "net/proxy_resolution/proxy_resolution_service.h"
 #include "net/ssl/ssl_config_service_defaults.h"
-#include "net/url_request/data_protocol_handler.h"
-#include "net/url_request/file_protocol_handler.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_builder.h"
 #include "net/url_request/url_request_context_getter.h"
@@ -247,28 +245,13 @@ void URLRequestContextFactory::InitializeMainContextDependencies(
       new net::URLRequestJobFactoryImpl());
   // Keep ProtocolHandlers added in sync with
   // CastContentBrowserClient::IsHandledURL().
-  bool set_protocol = false;
   for (content::ProtocolHandlerMap::iterator it = protocol_handlers->begin();
        it != protocol_handlers->end();
        ++it) {
-    set_protocol =
+    bool set_protocol =
         job_factory->SetProtocolHandler(it->first, std::move(it->second));
     DCHECK(set_protocol);
   }
-  set_protocol = job_factory->SetProtocolHandler(
-      url::kDataScheme, std::make_unique<net::DataProtocolHandler>());
-  DCHECK(set_protocol);
-
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableLocalFileAccesses)) {
-    set_protocol = job_factory->SetProtocolHandler(
-        url::kFileScheme,
-        std::make_unique<net::FileProtocolHandler>(base::CreateTaskRunner(
-            {base::ThreadPool(), base::MayBlock(),
-             base::TaskPriority::BEST_EFFORT,
-             base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN})));
-    DCHECK(set_protocol);
-  }
 
   // Set up interceptors in the reverse order.
   std::unique_ptr<net::URLRequestJobFactory> top_job_factory =