RTC_[D]CHECK_op: Remove "u" suffix on integer constants

webrtc/system_wrappers/include/aligned_array.h

Index: webrtc/system_wrappers/include/aligned_array.h
diff --git a/webrtc/system_wrappers/include/aligned_array.h b/webrtc/system_wrappers/include/aligned_array.h
index a2ffe99c145bb49261b971b0ef372bf9f3321697..71fefea72f428df399fb5835caec4d046ba5a754 100644
--- a/webrtc/system_wrappers/include/aligned_array.h
+++ b/webrtc/system_wrappers/include/aligned_array.h
@@ -23,7 +23,7 @@ template<typename T> class AlignedArray {
   AlignedArray(size_t rows, size_t cols, size_t alignment)
       : rows_(rows),
         cols_(cols) {
-    RTC_CHECK_GT(alignment, 0u);
+    RTC_CHECK_GT(alignment, 0);
     head_row_ = static_cast<T**>(AlignedMalloc(rows_ * sizeof(*head_row_),
                                                alignment));
     for (size_t i = 0; i < rows_; ++i) {