Add base:: to string16 in extensions/.

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BUG=329295

Review URL: https://codereview.chromium.org/107803004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242211 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/extensions/common/manifest_handlers/csp_info.cc b/extensions/common/manifest_handlers/csp_info.cc
index 79f531a4f..842a640 100644
--- a/extensions/common/manifest_handlers/csp_info.cc
+++ b/extensions/common/manifest_handlers/csp_info.cc
@@ -77,7 +77,7 @@
 CSPHandler::~CSPHandler() {
 }
 
-bool CSPHandler::Parse(Extension* extension, string16* error) {
+bool CSPHandler::Parse(Extension* extension, base::string16* error) {
   const std::string key = Keys()[0];
   if (!extension->manifest()->HasPath(key)) {
     if (extension->manifest_version() >= 2) {