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-Commit-Position: refs/heads/master@{#9964}
diff --git a/webrtc/common_audio/real_fourier.cc b/webrtc/common_audio/real_fourier.cc
index 29b704b..fef3c60 100644
--- a/webrtc/common_audio/real_fourier.cc
+++ b/webrtc/common_audio/real_fourier.cc
@@ -30,12 +30,12 @@
 }
 
 int RealFourier::FftOrder(size_t length) {
-  CHECK_GT(length, 0U);
+  RTC_CHECK_GT(length, 0U);
   return WebRtcSpl_GetSizeInBits(static_cast<uint32_t>(length - 1));
 }
 
 size_t RealFourier::FftLength(int order) {
-  CHECK_GE(order, 0);
+  RTC_CHECK_GE(order, 0);
   return static_cast<size_t>(1 << order);
 }