Normalize and update the header value checks to RFC 7230 for Fetch

Source/core/fetch/FetchUtils.cpp

Index: Source/core/fetch/FetchUtils.cpp
diff --git a/Source/core/fetch/FetchUtils.cpp b/Source/core/fetch/FetchUtils.cpp
index 4139db3f4428bb32a9a66747453e79fd4ffcbf12..e21730289e3ef2469a8448159c29d42a9821c271 100644
--- a/Source/core/fetch/FetchUtils.cpp
+++ b/Source/core/fetch/FetchUtils.cpp
@@ -14,6 +14,11 @@
 
 namespace blink {
 
+static bool isHTTPWhitespace(UChar chr)

[yhirano, 2015/09/09 04:41:50]

Please place this function in the unnamed namespace below instead of using
"static".

[shiva.jm, 2015/09/10 10:10:26]

Done.

+{
+    return chr <= ' ' && (chr == ' ' || chr == '\n' || chr == '\t' || chr == '\r');

[hiroshige, 2015/09/09 07:01:48]

"chr <= ' ' && " is not needed.

[shiva.jm, 2015/09/10 10:10:26]

Done.

+}
+
 namespace {
 
 class ForbiddenHeaderNames {
@@ -189,4 +194,13 @@ AtomicString FetchUtils::normalizeMethod(const AtomicString& method)
     return method;
 }
 
+String FetchUtils::normalizeHeaderValue(const String& value)
+{
+    // https://fetch.spec.whatwg.org/#concept-header-value-normalize
+    // Strip leading and trailing whitespace from header value.
+    // HTTP whitespace bytes are 0x09, 0x0A, 0x0D, and 0x20.
+
+    return value.stripWhiteSpace(isHTTPWhitespace);
+}
+
 } // namespace blink