LibWeb+WebContent: Hook Fetch's HTTP cache into the clear-cache action

And fix a typo in an invocation to clear the cache.

Libraries/LibWeb/Fetch/Fetching/Fetching.cpp

@@ -1669,6 +1669,11 @@ public:
         return s_cache;
     }
 
+    void clear_cache()
+    {
+        m_cache.clear();
+    }
+
 private:
     HashMap<Infrastructure::NetworkPartitionKey, NonnullRefPtr<CachePartition>> m_cache;
 };
@@ -2849,4 +2854,9 @@ void set_http_cache_enabled(bool const enabled)
     g_http_cache_enabled = enabled;
 }
 
+void clear_http_cache()
+{
+    HTTPCache::the().clear_cache();
+}
+
 }

Libraries/LibWeb/Fetch/Fetching/Fetching.h

@@ -56,5 +56,6 @@ void set_sec_fetch_user_header(Infrastructure::Request&);
 void append_fetch_metadata_headers_for_request(Infrastructure::Request&);
 
 WEB_API void set_http_cache_enabled(bool enabled);
+WEB_API void clear_http_cache();
 
 }

Libraries/LibWebView/Application.cpp

@@ -830,7 +830,7 @@ void Application::initialize_actions()
     m_debug_menu->add_separator();
 
     m_debug_menu->add_action(Action::create("Collect Garbage"sv, ActionID::CollectGarbage, debug_request("collect-garbage"sv)));
-    m_debug_menu->add_action(Action::create("Clear Cache"sv, ActionID::ClearCache, [this, clear_memory_cache = debug_request("clear_cache")]() {
+    m_debug_menu->add_action(Action::create("Clear Cache"sv, ActionID::ClearCache, [this, clear_memory_cache = debug_request("clear-cache")]() {
         m_request_server_client->async_clear_cache();
         clear_memory_cache();
     }));

Services/WebContent/ConnectionFromClient.cpp

@@ -33,6 +33,7 @@
 #include <LibWeb/DOM/ShadowRoot.h>
 #include <LibWeb/DOM/Text.h>
 #include <LibWeb/Dump.h>
+#include <LibWeb/Fetch/Fetching/Fetching.h>
 #include <LibWeb/HTML/BrowsingContext.h>
 #include <LibWeb/HTML/HTMLInputElement.h>
 #include <LibWeb/HTML/SelectedFile.h>
@@ -386,7 +387,7 @@ void ConnectionFromClient::debug_request(u64 page_id, ByteString request, ByteSt
     }
 
     if (request == "clear-cache") {
-        // FIXME: Clear the Fetch cache.
+        Web::Fetch::Fetching::clear_http_cache();
         return;
     }