Add RTC_ prefix to (D)CHECKs and related macros.

We must remove dependency on Chromium, i.e. we can't use Chromium's base/logging.h. That means we need to define these macros in WebRTC also when doing Chromium builds. And this causes redefinition.

Alternative solutions:
* Check if we already have defined e.g. CHECK, and don't define them in that case. This makes us depend on include order in Chromium, which is not acceptable.
* Don't allow using the macros in WebRTC headers. Error prone since if someone adds it there by mistake it may compile fine, but later break if a header in added or order is changed in Chromium. That will be confusing and hard to enforce.
* Ensure that headers that are included by an embedder don't include our macros. This would require some heavy refactoring to be maintainable and enforcable.
* Changes in Chromium for this is obviously not an option.

BUG=chromium:468375
NOTRY=true

Review URL: https://codereview.webrtc.org/1335923002

Cr-Original-Commit-Position: refs/heads/master@{#9964}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 91d6edef35e7275879c30ce16ecb8b6dc73c6e4a
diff --git a/base/asyncinvoker.cc b/base/asyncinvoker.cc
index ee53e04..563ccb7 100644
--- a/base/asyncinvoker.cc
+++ b/base/asyncinvoker.cc
@@ -96,7 +96,7 @@
 void GuardedAsyncInvoker::ThreadDestroyed() {
   rtc::CritScope cs(&crit_);
   // We should never get more than one notification about the thread dying.
-  DCHECK(thread_ != nullptr);
+  RTC_DCHECK(thread_ != nullptr);
   thread_ = nullptr;
 }