Simplify ownership handling of HTMLImportsController.

third_party/WebKit/Source/core/html/imports/LinkImport.cpp

Index: third_party/WebKit/Source/core/html/imports/LinkImport.cpp
diff --git a/third_party/WebKit/Source/core/html/imports/LinkImport.cpp b/third_party/WebKit/Source/core/html/imports/LinkImport.cpp
index 82609c7969feb8457fdea89591f172d3a571c506..ca8fcb4f0c40e9dea10491779b67252d6dc2afd3 100644
--- a/third_party/WebKit/Source/core/html/imports/LinkImport.cpp
+++ b/third_party/WebKit/Source/core/html/imports/LinkImport.cpp
@@ -73,8 +73,10 @@ void LinkImport::process()
         return;
 
     if (!m_owner->document().importsController()) {
-        ASSERT(m_owner->document().frame()); // The document should be the master.
-        HTMLImportsController::provideTo(m_owner->document());
+        // The document should be the master.
+        Document& master = m_owner->document();
+        ASSERT(master.frame());
+        master.setImportsController(HTMLImportsController::create(master));
     }
 
     LinkRequestBuilder builder(m_owner);