Revert of service worker: Don't control a subframe of an insecure context

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index f9c5602a6102cf49caa7c325114d588192cee7eb..76c57e79f91044268011c9d41f0a9e8943d5b79d 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -354,6 +354,15 @@
     return element.document().frame() && element.rootEditableElement();
 }
 
+static bool isOriginPotentiallyTrustworthy(SecurityOrigin* origin, String* errorMessage)
+{
+    if (origin->isPotentiallyTrustworthy())
+        return true;
+    if (errorMessage)
+        *errorMessage = origin->isPotentiallyTrustworthyErrorMessage();
+    return false;
+}
+
 uint64_t Document::s_globalTreeVersion = 0;
 
 static bool s_threadedParsingEnabledForTesting = true;
@@ -3311,7 +3320,7 @@
     setMimeType(other.contentType());
 }
 
-bool Document::isSecureContextImpl(const SecureContextCheck privilegeContextCheck) const
+bool Document::isSecureContextImpl(String* errorMessage, const SecureContextCheck privilegeContextCheck) const
 {
     // There may be exceptions for the secure context check defined for certain
     // schemes. The exceptions are applied only to the special scheme and to
@@ -3341,16 +3350,21 @@
     //
     // In all cases, a frame must be potentially trustworthy in addition to
     // having an exception listed in order for the exception to be granted.
-    if (!getSecurityOrigin()->isPotentiallyTrustworthy())
+    if (!isOriginPotentiallyTrustworthy(getSecurityOrigin(), errorMessage))
         return false;
 
     if (SchemeRegistry::schemeShouldBypassSecureContextCheck(getSecurityOrigin()->protocol()))
         return true;
 
     if (privilegeContextCheck == StandardSecureContextCheck) {
-        Frame* parent = m_frame ? m_frame->tree().parent() : nullptr;
-        if (parent && !parent->canHaveSecureChild())
-            return false;
+        if (!m_frame)
+            return true;
+        Frame* parent = m_frame->tree().parent();
+        while (parent) {
+            if (!isOriginPotentiallyTrustworthy(parent->securityContext()->getSecurityOrigin(), errorMessage))
+                return false;
+            parent = parent->tree().parent();
+        }
     }
     return true;
 }
@@ -5827,15 +5841,12 @@
 
 bool Document::isSecureContext(String& errorMessage, const SecureContextCheck privilegeContextCheck) const
 {
-    if (isSecureContextImpl(privilegeContextCheck))
-        return true;
-    errorMessage = SecurityOrigin::isPotentiallyTrustworthyErrorMessage();
-    return false;
+    return isSecureContextImpl(&errorMessage, privilegeContextCheck);
 }
 
 bool Document::isSecureContext(const SecureContextCheck privilegeContextCheck) const
 {
-    return isSecureContextImpl(privilegeContextCheck);
+    return isSecureContextImpl(nullptr, privilegeContextCheck);
 }
 
 WebTaskRunner* Document::loadingTaskRunner() const