Update to Chromium version 88.0.4324.0 (#827102)

- Mac: Xcode 12.2 and the MacOS 11.0 SDK are now required for building.
- MacOS 10.10 (Yosemite) is no longer supported (see https://crbug.com/1126056).
- Flash is no longer supported (see https://www.chromium.org/flash-roadmap).

libcef/browser/frame_host_impl.cc

@@ -17,6 +17,7 @@
 #include "libcef/common/request_impl.h"
 #include "libcef/common/task_runner_impl.h"
 
+#include "components/url_formatter/url_fixer.h"
 #include "content/browser/renderer_host/frame_tree_node.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
@@ -302,11 +303,21 @@ void CefFrameHostImpl::RefreshAttributes() {
     parent_frame_id_ = MakeFrameId(render_frame_host_->GetParent());
 }
 
+void CefFrameHostImpl::NotifyMoveOrResizeStarted() {
+  Send(new CefMsg_MoveOrResizeStarted(MSG_ROUTING_NONE));
+}
+
 void CefFrameHostImpl::Navigate(const CefNavigateParams& params) {
   CefMsg_LoadRequest_Params request;
-  request.url = params.url;
+
+  // Fix common problems with user-typed text. Among other things, this:
+  // - Converts absolute file paths to "file://" URLs.
+  // - Normalizes "about:" and "chrome:" to "chrome://" URLs.
+  // - Adds the "http://" scheme if none was specified.
+  request.url = url_formatter::FixupURL(params.url.possibly_invalid_spec(),
+                                        std::string());
   if (!request.url.is_valid()) {
-    LOG(ERROR) << "Invalid URL: " << params.url;
+    LOG(ERROR) << "Invalid URL: " << params.url.possibly_invalid_spec();
     return;
   }
 
@@ -336,16 +347,9 @@ void CefFrameHostImpl::LoadURLWithExtras(const std::string& url,
   if (frame_id < CefFrameHostImpl::kMainFrameId)
     return;
 
+  // Any necessary fixup of the URL will occur in
+  // [CefBrowserHostBase|CefFrameHostImpl]::Navigate().
   GURL gurl(url);
-  if (!gurl.is_valid() && !gurl.has_scheme()) {
-    // Try to add "http://" at the beginning.
-    std::string new_url = std::string("http://") + url;
-    gurl = GURL(new_url);
-  }
-  if (!gurl.is_valid()) {
-    LOG(ERROR) << "Invalid URL: " << url;
-    return;
-  }
 
   if (frame_id == CefFrameHostImpl::kMainFrameId) {
     // Load via the browser using NavigationController.