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/system_wrappers/interface/aligned_array.h b/webrtc/system_wrappers/interface/aligned_array.h
index 3648c7c..6d6c81b 100644
--- a/webrtc/system_wrappers/interface/aligned_array.h
+++ b/webrtc/system_wrappers/interface/aligned_array.h
@@ -24,7 +24,7 @@
       : rows_(rows),
         cols_(cols),
         alignment_(alignment) {
-    CHECK_GT(alignment_, 0);
+    RTC_CHECK_GT(alignment_, 0);
     head_row_ = static_cast<T**>(AlignedMalloc(rows_ * sizeof(*head_row_),
                                                alignment_));
     for (int i = 0; i < rows_; ++i) {
@@ -49,22 +49,22 @@
   }
 
   T* Row(int row) {
-    CHECK_LE(row, rows_);
+    RTC_CHECK_LE(row, rows_);
     return head_row_[row];
   }
 
   const T* Row(int row) const {
-    CHECK_LE(row, rows_);
+    RTC_CHECK_LE(row, rows_);
     return head_row_[row];
   }
 
   T& At(int row, size_t col) {
-    CHECK_LE(col, cols_);
+    RTC_CHECK_LE(col, cols_);
     return Row(row)[col];
   }
 
   const T& At(int row, size_t col) const {
-    CHECK_LE(col, cols_);
+    RTC_CHECK_LE(col, cols_);
     return Row(row)[col];
   }