Mark the AtomicString(const String&) constructor as explicit

Source/core/css/resolver/StyleBuilderCustom.cpp

Index: Source/core/css/resolver/StyleBuilderCustom.cpp
diff --git a/Source/core/css/resolver/StyleBuilderCustom.cpp b/Source/core/css/resolver/StyleBuilderCustom.cpp
index fa26cb1f1e5d5f735451ac4e5de53fc83782e990..e56e1aa9c9bcc3aed21c9d93303010d903327ed4 100755
--- a/Source/core/css/resolver/StyleBuilderCustom.cpp
+++ b/Source/core/css/resolver/StyleBuilderCustom.cpp
@@ -661,7 +661,7 @@ void StyleBuilderFunctions::applyValueCSSPropertyWebkitClipPath(StyleResolverSta
             String cssURLValue = primitiveValue->getStringValue();
             KURL url = state.document().completeURL(cssURLValue);
             // FIXME: It doesn't work with forward or external SVG references (see https://bugs.webkit.org/show_bug.cgi?id=90405)
-            state.style()->setClipPath(ReferenceClipPathOperation::create(cssURLValue, url.fragmentIdentifier()));
+            state.style()->setClipPath(ReferenceClipPathOperation::create(cssURLValue, AtomicString(url.fragmentIdentifier())));
         }
     }
 }