Make calls to AtomicString(const String&) explicit in loader/ and fetch/

Source/platform/weborigin/SecurityOrigin.cpp

Index: Source/platform/weborigin/SecurityOrigin.cpp
diff --git a/Source/platform/weborigin/SecurityOrigin.cpp b/Source/platform/weborigin/SecurityOrigin.cpp
index 95fbf48842cdf409d9294cdd2ff453f9ec2d382e..bacb7ba42f1a30cb2c22368b50baa2e81c1beca5 100644
--- a/Source/platform/weborigin/SecurityOrigin.cpp
+++ b/Source/platform/weborigin/SecurityOrigin.cpp
@@ -418,23 +418,46 @@ String SecurityOrigin::toString() const
     return toRawString();
 }
 
+AtomicString SecurityOrigin::toAtomicString() const
+{
+    if (isUnique())
+        return AtomicString("null", AtomicString::ConstructFromLiteral);
+    if (m_protocol == "file" && m_enforceFilePathSeparation)
+        return AtomicString("null", AtomicString::ConstructFromLiteral);
+    return toRawAtomicString();
+}
+
 String SecurityOrigin::toRawString() const
 {
     if (m_protocol == "file")
         return "file://";
 
     StringBuilder result;
-    result.reserveCapacity(m_protocol.length() + m_host.length() + 10);
-    result.append(m_protocol);
-    result.append("://");
-    result.append(m_host);
+    buildRawString(result);
+    return result.toString();
+}
+
+AtomicString SecurityOrigin::toRawAtomicString() const
+{
+    if (m_protocol == "file")
+        return AtomicString("file://", AtomicString::ConstructFromLiteral);
+
+    StringBuilder result;
+    buildRawString(result);
+    return result.toAtomicString();
+}
+
+inline void SecurityOrigin::buildRawString(StringBuilder& builder) const
+{
+    builder.reserveCapacity(m_protocol.length() + m_host.length() + 10);
+    builder.append(m_protocol);
+    builder.appendLiteral("://");
+    builder.append(m_host);
 
     if (m_port) {
-        result.append(':');
-        result.appendNumber(m_port);
+        builder.append(':');
+        builder.appendNumber(m_port);
     }
-
-    return result.toString();
 }
 
 PassRefPtr<SecurityOrigin> SecurityOrigin::createFromString(const String& originString)