Add explicit base namespace to string16 users.

chrome/common/extensions/manifest_handlers/app_launch_info.cc

Index: chrome/common/extensions/manifest_handlers/app_launch_info.cc
diff --git a/chrome/common/extensions/manifest_handlers/app_launch_info.cc b/chrome/common/extensions/manifest_handlers/app_launch_info.cc
index fe3fbea69f4be9bc5e5e4c4f919e448f32226a0e..7b3d07ec73282dc14c9f1b3044d83baa348d5cb5 100644
--- a/chrome/common/extensions/manifest_handlers/app_launch_info.cc
+++ b/chrome/common/extensions/manifest_handlers/app_launch_info.cc
@@ -27,7 +27,7 @@ bool ReadLaunchDimension(const extensions::Manifest* manifest,
                          const char* key,
                          int* target,
                          bool is_valid_container,
-                         string16* error) {
+                         base::string16* error) {
   const Value* temp = NULL;
   if (manifest->Get(key, &temp)) {
     if (!is_valid_container) {
@@ -104,14 +104,14 @@ GURL AppLaunchInfo::GetFullLaunchURL(const Extension* extension) {
     return extension->url().Resolve(info.launch_local_path_);
 }
 
-bool AppLaunchInfo::Parse(Extension* extension, string16* error) {
+bool AppLaunchInfo::Parse(Extension* extension, base::string16* error) {
   if (!LoadLaunchURL(extension, error) ||
       !LoadLaunchContainer(extension, error))
     return false;
   return true;
 }
 
-bool AppLaunchInfo::LoadLaunchURL(Extension* extension, string16* error) {
+bool AppLaunchInfo::LoadLaunchURL(Extension* extension, base::string16* error) {
   const Value* temp = NULL;
 
   // Launch URL can be either local (to chrome-extension:// root) or an absolute
@@ -225,7 +225,7 @@ bool AppLaunchInfo::LoadLaunchURL(Extension* extension, string16* error) {
 }
 
 bool AppLaunchInfo::LoadLaunchContainer(Extension* extension,
-                                        string16* error) {
+                                        base::string16* error) {
   const Value* tmp_launcher_container = NULL;
   if (!extension->manifest()->Get(keys::kLaunchContainer,
                                   &tmp_launcher_container))
@@ -299,7 +299,8 @@ AppLaunchManifestHandler::AppLaunchManifestHandler() {
 AppLaunchManifestHandler::~AppLaunchManifestHandler() {
 }
 
-bool AppLaunchManifestHandler::Parse(Extension* extension, string16* error) {
+bool AppLaunchManifestHandler::Parse(Extension* extension,
+                                     base::string16* error) {
   scoped_ptr<AppLaunchInfo> info(new AppLaunchInfo);
   if (!info->Parse(extension, error))
     return false;