Replace RTC_DCHECK(false) with RTC_NOTREACHED().

webrtc/base/stringencode.cc

Index: webrtc/base/stringencode.cc
diff --git a/webrtc/base/stringencode.cc b/webrtc/base/stringencode.cc
index ab04d0285659a393da654d3015c29acbe0286eef..7c11a05e3e916c5a9c1015a0208448182bb01286 100644
--- a/webrtc/base/stringencode.cc
+++ b/webrtc/base/stringencode.cc
@@ -119,7 +119,7 @@ const char* unsafe_filename_characters() {
   return "\\/:*?\"<>|";
 #else  // !WEBRTC_WIN
   // TODO(grunell): Should this never be reached?
-  RTC_DCHECK(false);
+  RTC_NOTREACHED();
   return "";
 #endif  // !WEBRTC_WIN
 }
@@ -274,7 +274,7 @@ size_t html_encode(char * buffer, size_t buflen,
           case '\'': escseq = "&#39;";  esclen = 5; break;
           case '\"': escseq = "&quot;"; esclen = 6; break;
           case '&':  escseq = "&amp;";  esclen = 5; break;
-          default: RTC_DCHECK(false);
+          default: RTC_NOTREACHED();
         }
         if (bufpos + esclen >= buflen) {
           break;
@@ -331,7 +331,7 @@ size_t xml_encode(char * buffer, size_t buflen,
         case '\'': escseq = "&apos;"; esclen = 6; break;
         case '\"': escseq = "&quot;"; esclen = 6; break;
         case '&':  escseq = "&amp;";  esclen = 5; break;
-        default: RTC_DCHECK(false);
+        default: RTC_NOTREACHED();
       }
       if (bufpos + esclen >= buflen) {
         break;