build: move libcc patches to electron repo (#14104)

In the GN build, libchromiumcontent is no longer a distinct library, but
merely a container for a set of scripts and patches. Maintaining those
patches in a separate repository is tedious and error-prone, so merge
them into the main repo.

Once this is merged and GN is the default way to build Electron, the
libchromiumcontent repository can be archived.

patches/common/chromium/no_stack_dumping.patch

@@ -0,0 +1,13 @@
+diff --git a/content/app/content_main_runner.cc b/content/app/content_main_runner.cc
+index c283922..397ba80 100644
+--- a/content/app/content_main_runner.cc
++++ b/content/app/content_main_runner.cc
+@@ -657,7 +657,7 @@ class ContentMainRunnerImpl : public ContentMainRunner {
+ 
+     InitializeV8IfNeeded(command_line, process_type);
+ 
+-#if !defined(OFFICIAL_BUILD)
++#if 0
+ #if defined(OS_WIN)
+     bool should_enable_stack_dump = !process_type.empty();
+ #else