Fix plugins' mixed content status.

Source/core/loader/MixedContentChecker.cpp

Index: Source/core/loader/MixedContentChecker.cpp
diff --git a/Source/core/loader/MixedContentChecker.cpp b/Source/core/loader/MixedContentChecker.cpp
index c0b0e6a7b7e6206799fe5c66aeaeda0e9a14342f..5c26f56b6ecc54aa1b70739642c2ebc2ed64cfcd 100644
--- a/Source/core/loader/MixedContentChecker.cpp
+++ b/Source/core/loader/MixedContentChecker.cpp
@@ -112,7 +112,7 @@ MixedContentChecker::ContextType MixedContentChecker::contextTypeFromContext(Web
     // Plugins! Oh how dearly we love plugin-loaded content!
     case WebURLRequest::RequestContextPlugin: {
         Settings* settings = frame->settings();
-        return settings || settings->strictMixedContentCheckingForPlugin() ? ContextTypeBlockable : ContextTypeOptionallyBlockable;
+        return settings && settings->strictMixedContentCheckingForPlugin() ? ContextTypeBlockable : ContextTypeOptionallyBlockable;
     }
 
     // "Blockable" mixed content