base: Move SplitString functions into the base namespace and update the callers.

chrome/browser/extensions/extension_devtools_events.cc

Index: chrome/browser/extensions/extension_devtools_events.cc
diff --git a/chrome/browser/extensions/extension_devtools_events.cc b/chrome/browser/extensions/extension_devtools_events.cc
index f29d45966bfd9d45cba33c09739fe6b1b22e7622..07b691ef1156198b9a299be7e40caf42316647d2 100644
--- a/chrome/browser/extensions/extension_devtools_events.cc
+++ b/chrome/browser/extensions/extension_devtools_events.cc
@@ -28,7 +28,8 @@ bool ExtensionDevToolsEvents::IsDevToolsEventName(
                       true /* case_sensitive */)) {
     // At this point we want something like "4.onPageEvent"
     std::vector<std::string> parts;
-    SplitString(event_name.substr(strlen(kDevToolsEventPrefix)), '.', &parts);
+    base::SplitString(
+        event_name.substr(strlen(kDevToolsEventPrefix)), '.', &parts);
     if (parts.size() == 2 && base::StringToInt(parts[0], tab_id)) {
       return true;
     }