Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/platform/weborigin/SecurityOrigin.cpp

Index: third_party/WebKit/Source/platform/weborigin/SecurityOrigin.cpp
diff --git a/third_party/WebKit/Source/platform/weborigin/SecurityOrigin.cpp b/third_party/WebKit/Source/platform/weborigin/SecurityOrigin.cpp
index cee33ee147628a361ea28f019bff9ca017e59828..8d5b1a4f2948c679a7a0ec7bb7fc0351d5dd88aa 100644
--- a/third_party/WebKit/Source/platform/weborigin/SecurityOrigin.cpp
+++ b/third_party/WebKit/Source/platform/weborigin/SecurityOrigin.cpp
@@ -435,9 +435,9 @@ String SecurityOrigin::toString() const
 AtomicString SecurityOrigin::toAtomicString() const
 {
     if (isUnique())
-        return AtomicString("null", AtomicString::ConstructFromLiteral);
+        return AtomicString("null");
     if (isLocal() && m_blockLocalAccessFromLocalOrigin)
-        return AtomicString("null", AtomicString::ConstructFromLiteral);
+        return AtomicString("null");
     return toRawAtomicString();
 }
 
@@ -492,7 +492,7 @@ bool SecurityOrigin::deserializeSuboriginAndHost(const String& oldHost, String&
 AtomicString SecurityOrigin::toRawAtomicString() const
 {
     if (m_protocol == "file")
-        return AtomicString("file://", AtomicString::ConstructFromLiteral);
+        return AtomicString("file://");
 
     StringBuilder result;
     buildRawString(result, true);