Move RemoveChars, ReplaceChars, TrimString, and TruncateUTF8ToByteSize to base namespace.

chrome/browser/search/iframe_source.cc

Index: chrome/browser/search/iframe_source.cc
diff --git a/chrome/browser/search/iframe_source.cc b/chrome/browser/search/iframe_source.cc
index 58a5c06dfc3f2d84ea147c09d6d0ff6a7ac23e03..b44ed3046c88b9fdd8e88bca658548cb0b84201f 100644
--- a/chrome/browser/search/iframe_source.cc
+++ b/chrome/browser/search/iframe_source.cc
@@ -64,7 +64,7 @@ bool IframeSource::GetOrigin(
     return false;
   *origin = contents->GetURL().GetOrigin().spec();
   // Origin should not include a trailing slash. That is part of the path.
-  TrimString(*origin, "/", origin);
+  base::TrimString(*origin, "/", origin);
   return true;
 }