Revert of Replace all occurrences of RELEASE_ASSERT in wtf with CHECK.

third_party/WebKit/Source/wtf/text/AtomicString.cpp

Index: third_party/WebKit/Source/wtf/text/AtomicString.cpp
diff --git a/third_party/WebKit/Source/wtf/text/AtomicString.cpp b/third_party/WebKit/Source/wtf/text/AtomicString.cpp
index 17e6c44a58834d59aa6bf2e8da814043818e754b..63d7abdad3e3356a70665ac6a78ae41b239bce62 100644
--- a/third_party/WebKit/Source/wtf/text/AtomicString.cpp
+++ b/third_party/WebKit/Source/wtf/text/AtomicString.cpp
@@ -406,7 +406,7 @@ void AtomicString::remove(StringImpl* r)
         iterator = findString<LChar>(r);
     else
         iterator = findString<UChar>(r);
-    CHECK(iterator != atomicStrings().end());
+    RELEASE_ASSERT(iterator != atomicStrings().end());
     atomicStrings().remove(iterator);
 }