Make calls to AtomicString(const String&) explicit in web/

Source/core/loader/FrameLoadRequest.h

Index: Source/core/loader/FrameLoadRequest.h
diff --git a/Source/core/loader/FrameLoadRequest.h b/Source/core/loader/FrameLoadRequest.h
index 5f854f83f6a67e5845e407ac798c6ddef67c6626..09d992a26500a960272c9f0969e6174c428f6d93 100644
--- a/Source/core/loader/FrameLoadRequest.h
+++ b/Source/core/loader/FrameLoadRequest.h
@@ -55,7 +55,7 @@ public:
     {
     }
 
-    FrameLoadRequest(Document* originDocument, const ResourceRequest& resourceRequest, const String& frameName)
+    FrameLoadRequest(Document* originDocument, const ResourceRequest& resourceRequest, const AtomicString& frameName)
         : m_originDocument(originDocument)
         , m_resourceRequest(resourceRequest)
         , m_frameName(frameName)
@@ -80,8 +80,8 @@ public:
     ResourceRequest& resourceRequest() { return m_resourceRequest; }
     const ResourceRequest& resourceRequest() const { return m_resourceRequest; }
 
-    const String& frameName() const { return m_frameName; }
-    void setFrameName(const String& frameName) { m_frameName = frameName; }
+    const AtomicString& frameName() const { return m_frameName; }
+    void setFrameName(const AtomicString& frameName) { m_frameName = frameName; }
 
     const SubstituteData& substituteData() const { return m_substituteData; }
 
@@ -103,7 +103,7 @@ public:
 private:
     RefPtr<Document> m_originDocument;
     ResourceRequest m_resourceRequest;
-    String m_frameName;
+    AtomicString m_frameName;
     SubstituteData m_substituteData;
     bool m_lockBackForwardList;
     ClientRedirectPolicy m_clientRedirect;