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/v8/ostreams.patch

@@ -0,0 +1,13 @@
+diff --git a/src/ostreams.h b/src/ostreams.h
+index e72c8ee..9f25bca 100644
+--- a/src/ostreams.h
++++ b/src/ostreams.h
+@@ -34,7 +34,7 @@ class OFStreamBase : public std::streambuf {
+ 
+ 
+ // An output stream writing to a file.
+-class V8_EXPORT_PRIVATE OFStream : public std::ostream {
++class V8_EXPORT_PRIVATE OFStream : public NON_EXPORTED_BASE(std::ostream) {
+  public:
+   explicit OFStream(FILE* f);
+   virtual ~OFStream();