chore: remove mips64el patches as they've largely been upstreamed (#18628)

patches/chromium/blink_local_frame.patch

@@ -0,0 +1,41 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Cheng Zhao <zcbenz@gmail.com>
+Date: Thu, 20 Sep 2018 17:45:03 -0700
+Subject: blink_local_frame.patch
+
+According to electron/electron#3699, it is unreliable to use |unload|
+event for process.exit('exit'), so we have to do that in
+willReleaseScriptContext.
+
+However Chromium then disallowed scripting in willReleaseScriptContext
+in https://codereview.chromium.org/1657583002, and crash will happen
+when there is code doing that.
+
+This patch reverts the change to fix the crash in Electron.
+
+diff --git a/third_party/blink/renderer/core/frame/local_frame.cc b/third_party/blink/renderer/core/frame/local_frame.cc
+index 06f9c9f62dc94bd093942d9ee523a4279203a177..3ee1caa9ad92cfedd326b364817ce9b5e8db800e 100644
+--- a/third_party/blink/renderer/core/frame/local_frame.cc
++++ b/third_party/blink/renderer/core/frame/local_frame.cc
+@@ -393,10 +393,6 @@ void LocalFrame::DetachImpl(FrameDetachType type) {
+   }
+   CHECK(!view_ || !view_->IsAttached());
+ 
+-  // This is the earliest that scripting can be disabled:
+-  // - FrameLoader::Detach() can fire XHR abort events
+-  // - Document::Shutdown() can dispose plugins which can run script.
+-  ScriptForbiddenScope forbid_script;
+   if (!Client())
+     return;
+ 
+@@ -414,6 +410,10 @@ void LocalFrame::DetachImpl(FrameDetachType type) {
+   // Notify ScriptController that the frame is closing, since its cleanup ends
+   // up calling back to LocalFrameClient via WindowProxy.
+   GetScriptController().ClearForClose();
++  // This is the earliest that scripting can be disabled:
++  // - FrameLoader::Detach() can fire XHR abort events
++  // - Document::Shutdown() can dispose plugins which can run script.
++  ScriptForbiddenScope forbid_script;
+ 
+   // TODO(crbug.com/729196): Trace why LocalFrameView::DetachFromLayout crashes.
+   CHECK(!view_->IsAttached());