Move RemoveChars, ReplaceChars, TrimString, and TruncateUTF8ToByteSize to base namespace.

net/base/net_util.cc

Index: net/base/net_util.cc
diff --git a/net/base/net_util.cc b/net/base/net_util.cc
index e5200e77f7647c62caa5e95617fa715db9f8ce28..4a4ff525f1328e7e12faa7dacda9583482f2ac6d 100644
--- a/net/base/net_util.cc
+++ b/net/base/net_util.cc
@@ -773,7 +773,7 @@ void SanitizeGeneratedFileName(base::FilePath::StringType* filename,
     if (trimmed)
       filename->insert(filename->end(), trimmed, kReplace[0]);
   }
-  TrimString(*filename, FILE_PATH_LITERAL("."), filename);
+  base::TrimString(*filename, FILE_PATH_LITERAL("."), filename);
   if (filename->empty())
     return;
   // Replace any path information by changing path separators.