RELEASE_ASSERT -> CHECK and ASSERT -> DCHECK in web.

third_party/WebKit/Source/web/WebFrameSerializer.cpp

Index: third_party/WebKit/Source/web/WebFrameSerializer.cpp
diff --git a/third_party/WebKit/Source/web/WebFrameSerializer.cpp b/third_party/WebKit/Source/web/WebFrameSerializer.cpp
index 2c8a1e6113ba1a03abfef366985b4ff273a107e7..09fab010910923bea9bed94a704d40d0052a75d2 100644
--- a/third_party/WebKit/Source/web/WebFrameSerializer.cpp
+++ b/third_party/WebKit/Source/web/WebFrameSerializer.cpp
@@ -111,7 +111,7 @@ bool MHTMLFrameSerializerDelegate::rewriteLink(
         return false;
 
     KURL cidURI = MHTMLParser::convertContentIDToURI(contentID);
-    ASSERT(cidURI.isValid());
+    DCHECK(cidURI.isValid());
 
     if (isHTMLFrameElementBase(&element)) {
         rewrittenLink = cidURI.getString();
@@ -154,8 +154,8 @@ WebData WebFrameSerializer::generateMHTMLParts(
     const WebString& boundary, WebLocalFrame* webFrame, bool useBinaryEncoding,
     MHTMLPartsGenerationDelegate* webDelegate)
 {
-    ASSERT(webFrame);
-    ASSERT(webDelegate);
+    DCHECK(webFrame);
+    DCHECK(webDelegate);
 
     // Translate arguments from public to internal blink APIs.
     LocalFrame* frame = toWebLocalFrameImpl(webFrame)->frame();