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)

[Yuta Kitamura, 2016/05/20 07:12:56]

Is there any reason this is guarded with
OFFICIAL_BUILD && NDEBUG? Doesn't CHECK() fail
unconditionally?

[kotenkov, 2016/05/24 07:50:06]

It does, but compiler doesn't have a way to see it, because CHECK() just calls a
function in the #else case here. These ifdefs are needed to avoid a compilation
error. Actually I think the NO_RETURN_DUE_TO_CRASH doesn't have much influence
on the performance, so we can remove it and have more concise and clear code.

     NO_RETURN_DUE_TO_CRASH void writeTo(LChar*)
+#else
+    void writeTo(LChar*)
+#endif
     {
-        RELEASE_ASSERT(false);
+        CHECK(false);
     }
 
     void writeTo(UChar* destination);