Move StringToLowerASCII to base namespace

gpu/config/gpu_control_list.cc

Index: gpu/config/gpu_control_list.cc
diff --git a/gpu/config/gpu_control_list.cc b/gpu/config/gpu_control_list.cc
index dc5c75c11f4c7ef5c789d3b67205ebcd4e495ffc..444c186b39bfc2dd50def14749e820a497e6197c 100644
--- a/gpu/config/gpu_control_list.cc
+++ b/gpu/config/gpu_control_list.cc
@@ -264,11 +264,11 @@ GpuControlList::OsType GpuControlList::OsInfo::StringToOsType(
 GpuControlList::StringInfo::StringInfo(const std::string& string_op,
                                      const std::string& string_value) {
   op_ = StringToOp(string_op);
-  value_ = StringToLowerASCII(string_value);
+  value_ = base::StringToLowerASCII(string_value);
 }
 
 bool GpuControlList::StringInfo::Contains(const std::string& value) const {
-  std::string my_value = StringToLowerASCII(value);
+  std::string my_value = base::StringToLowerASCII(value);
   switch (op_) {
     case kContains:
       return strstr(my_value.c_str(), value_.c_str()) != NULL;