Fix a data URL generation code in DeveloperPrivateAPI

chrome/browser/extensions/api/developer_private/developer_private_api.cc

Index: chrome/browser/extensions/api/developer_private/developer_private_api.cc
diff --git a/chrome/browser/extensions/api/developer_private/developer_private_api.cc b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
index 3d68ee33a0d818e084c4a2f6f76dbdeca0c5bb74..1a05e79284486f08bcc44a98bcd7e4c903255cee 100644
--- a/chrome/browser/extensions/api/developer_private/developer_private_api.cc
+++ b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
@@ -101,7 +101,7 @@ GURL GetImageURLFromData(const std::string& contents) {
   base::Base64Encode(contents, &contents_base64);
 
   // TODO(dvh): make use of content::kDataScheme. Filed as crbug/297301.
-  const char kDataURLPrefix[] = "data:image;base64,";
+  const char kDataURLPrefix[] = "data:;base64,";
   return GURL(kDataURLPrefix + contents_base64);
 }