Move TrimWhitespace to the base namespace.

ui/gfx/font_fallback_win.cc

Index: ui/gfx/font_fallback_win.cc
diff --git a/ui/gfx/font_fallback_win.cc b/ui/gfx/font_fallback_win.cc
index ab363e45b69394ec16480065f0e48ca5a35ab2cc..4426718959b3be04a65160f23b808036d94dc64d 100644
--- a/ui/gfx/font_fallback_win.cc
+++ b/ui/gfx/font_fallback_win.cc
@@ -180,7 +180,8 @@ void ParseFontFamilyString(const std::string& family,
     const size_t index = font_names->back().find('(');
     if (index != std::string::npos) {
       font_names->back().resize(index);
-      TrimWhitespace(font_names->back(), TRIM_TRAILING, &font_names->back());
+      base::TrimWhitespace(font_names->back(), base::TRIM_TRAILING,
+                           &font_names->back());
     }
   }
 }