Cleanup: Better constify some strings in chrome.

chrome/utility/web_resource_unpacker.cc

Index: chrome/utility/web_resource_unpacker.cc
diff --git a/chrome/utility/web_resource_unpacker.cc b/chrome/utility/web_resource_unpacker.cc
index 3122200b0af1dfa1eec0cafb7a12c968661d50f4..648a5d14a4fff08849d310d215821a8cca5a91bb 100644
--- a/chrome/utility/web_resource_unpacker.cc
+++ b/chrome/utility/web_resource_unpacker.cc
@@ -7,10 +7,10 @@
 #include "base/json/json_reader.h"
 #include "base/values.h"
 
-const char* WebResourceUnpacker::kInvalidDataTypeError =
+const char WebResourceUnpacker::kInvalidDataTypeError[] =
     "Data from web resource server is missing or not valid JSON.";
 
-const char* WebResourceUnpacker::kUnexpectedJSONFormatError =
+const char WebResourceUnpacker::kUnexpectedJSONFormatError[] =
     "Data from web resource server does not have expected format.";
 
 WebResourceUnpacker::WebResourceUnpacker(const std::string &resource_data)