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

chrome/browser/nacl_host/nacl_browser_delegate_impl.cc

Index: chrome/browser/nacl_host/nacl_browser_delegate_impl.cc
diff --git a/chrome/browser/nacl_host/nacl_browser_delegate_impl.cc b/chrome/browser/nacl_host/nacl_browser_delegate_impl.cc
index d5171a153e27089a037a0fc464ef4f9377676dfb..a0e92bdc6839b1e3b57e5ab74587166f2b38154d 100644
--- a/chrome/browser/nacl_host/nacl_browser_delegate_impl.cc
+++ b/chrome/browser/nacl_host/nacl_browser_delegate_impl.cc
@@ -138,7 +138,7 @@ bool NaClBrowserDelegateImpl::MapUrlToLocalFilePath(
   if (!use_blocking_api) {
     if (file_url.SchemeIs(extensions::kExtensionScheme)) {
       std::string path = file_url.path();
-      TrimString(path, "/", &path);  // Remove first slash
+      base::TrimString(path, "/", &path);  // Remove first slash
       *file_path = extension->path().AppendASCII(path);
       return true;
     }