Replace all occurrences of RELEASE_ASSERT in wtf with CHECK.

third_party/WebKit/Source/wtf/text/StringConcatenate.h

Index: third_party/WebKit/Source/wtf/text/StringConcatenate.h
diff --git a/third_party/WebKit/Source/wtf/text/StringConcatenate.h b/third_party/WebKit/Source/wtf/text/StringConcatenate.h
index 63a7c4e296292295007d7a15bff37fa10dac4e9e..10d970a52cb39d154021bc5b82f224920097b114 100644
--- a/third_party/WebKit/Source/wtf/text/StringConcatenate.h
+++ b/third_party/WebKit/Source/wtf/text/StringConcatenate.h
@@ -171,9 +171,13 @@ public:
 
     bool is8Bit() { return false; }
 
+#if defined(OFFICIAL_BUILD) && defined(NDEBUG)
     NO_RETURN_DUE_TO_CRASH void writeTo(LChar*)
+#else
+    void writeTo(LChar*)
+#endif
     {
-        RELEASE_ASSERT(false);
+        CHECK(false);
     }
 
     void writeTo(UChar* destination);