Remove redundant c_str() calls.

chrome/browser/component_updater/pnacl_component_installer.cc

Index: chrome/browser/component_updater/pnacl_component_installer.cc
diff --git a/chrome/browser/component_updater/pnacl_component_installer.cc b/chrome/browser/component_updater/pnacl_component_installer.cc
index ed6b5b085dbead34e290e8b230d592806b12c7cf..1256f951ef3864783501c29d5c5e69fb281bfd1b 100644
--- a/chrome/browser/component_updater/pnacl_component_installer.cc
+++ b/chrome/browser/component_updater/pnacl_component_installer.cc
@@ -185,7 +185,7 @@ bool CheckPnaclComponentManifest(const base::DictionaryValue& manifest,
     LOG(WARNING) << "'version' field is missing from manifest!";
     return false;
   }
-  base::Version version(proposed_version.c_str());
+  base::Version version(proposed_version);
   if (!version.IsValid()) {
     LOG(WARNING) << "'version' field in manifest is invalid "
                  << version.GetString();