Modify SRI and CSP console messages to base64 hashes, not base64url.

Source/core/frame/csp/CSPDirectiveList.cpp

Index: Source/core/frame/csp/CSPDirectiveList.cpp
diff --git a/Source/core/frame/csp/CSPDirectiveList.cpp b/Source/core/frame/csp/CSPDirectiveList.cpp
index a0c50950f6c0bbbc4f43e89b7b8a335bcfdee7c5..d88ffc3725a9747107df8c71f57d77f543c839fa 100644
--- a/Source/core/frame/csp/CSPDirectiveList.cpp
+++ b/Source/core/frame/csp/CSPDirectiveList.cpp
@@ -32,9 +32,7 @@ String getSha256String(const String& content)
         return "sha256-...";
     }
 
-    // For consistency with Subresource Integrity, we output base64url encoded
-    // data in error messages.
-    return "sha256-" + base64URLEncode(reinterpret_cast<char*>(digest.data()), digest.size(), Base64DoNotInsertLFs);
+    return "sha256-" + base64Encode(reinterpret_cast<char*>(digest.data()), digest.size(), Base64DoNotInsertLFs);
 }
 
 }