Revert of Rendering text to a canvas in a frame-less document.

third_party/WebKit/Source/core/dom/StyleEngine.cpp

Index: third_party/WebKit/Source/core/dom/StyleEngine.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleEngine.cpp b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
index c19ca69998809a5f109748fc23b99429542a7d63..3a940d167532603cf46d514d33d39484b8ae1a06 100644
--- a/third_party/WebKit/Source/core/dom/StyleEngine.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
@@ -62,9 +62,12 @@ StyleEngine::StyleEngine(Document& document)
     : m_document(&document)
     , m_isMaster(!document.importsController() || document.importsController()->master() == &document)
     , m_documentStyleSheetCollection(DocumentStyleSheetCollection::create(document))
+    // We don't need to create CSSFontSelector for imported document or
+    // HTMLTemplateElement's document, because those documents have no frame.
+    , m_fontSelector(document.frame() ? CSSFontSelector::create(&document) : nullptr)
 {
-    m_fontSelector = CSSFontSelector::create(m_document);
-    m_fontSelector->registerForInvalidationCallbacks(this);
+    if (m_fontSelector)
+        m_fontSelector->registerForInvalidationCallbacks(this);
 }
 
 StyleEngine::~StyleEngine()