Move ReplaceStringPlaceholders to base namespace.

chrome/browser/ui/app_list/search/launcher_search/launcher_search_icon_image_loader.cc

Index: chrome/browser/ui/app_list/search/launcher_search/launcher_search_icon_image_loader.cc
diff --git a/chrome/browser/ui/app_list/search/launcher_search/launcher_search_icon_image_loader.cc b/chrome/browser/ui/app_list/search/launcher_search/launcher_search_icon_image_loader.cc
index 789a2d2e4c0cf72326bb6ba5cef009f1adede58f..d153d1f9c7ad5353627ba17a57691a9a70e6e73e 100644
--- a/chrome/browser/ui/app_list/search/launcher_search/launcher_search_icon_image_loader.cc
+++ b/chrome/browser/ui/app_list/search/launcher_search/launcher_search_icon_image_loader.cc
@@ -62,7 +62,7 @@ void LauncherSearchIconImageLoader::LoadResources() {
     params.push_back(GetTruncatedIconUrl(kTruncatedIconUrlMaxSize));
     params.push_back(extensions::kExtensionScheme);
     params.push_back(extension_->id());
-    error_reporter_->Warn(ReplaceStringPlaceholders(
+    error_reporter_->Warn(base::ReplaceStringPlaceholders(
         "$1 Invalid icon URL: $2. Must have a valid URL within $3://$4.",
         params, nullptr));
     return;
@@ -119,7 +119,7 @@ void LauncherSearchIconImageLoader::OnCustomIconLoaded(
     std::vector<std::string> params;
     params.push_back(kWarningMessagePrefix);
     params.push_back(GetTruncatedIconUrl(kTruncatedIconUrlMaxSize));
-    error_reporter_->Warn(ReplaceStringPlaceholders(
+    error_reporter_->Warn(base::ReplaceStringPlaceholders(
         "$1 Failed to load icon URL: $2", params, nullptr));
 
     return;