Block HTML Imports from loading when inserted via innerHTML.

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 340a8408874d0b1056ff39277c60bb37fc0cdd33..ce84e40005626de6c7157a2bf98426b945b1af31 100644
--- a/third_party/WebKit/Source/core/html/imports/LinkImport.cpp
+++ b/third_party/WebKit/Source/core/html/imports/LinkImport.cpp
@@ -77,6 +77,8 @@ void LinkImport::process()
         return;
     if (!shouldLoadResource())
         return;
+    if (m_owner->isAlreadyStarted())
+        return;
 
     if (!m_owner->document().importsController()) {
         ASSERT(m_owner->document().frame()); // The document should be the master.