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

gpu/config/gpu_info_collector_mac.mm

Index: gpu/config/gpu_info_collector_mac.mm
diff --git a/gpu/config/gpu_info_collector_mac.mm b/gpu/config/gpu_info_collector_mac.mm
index 1f7fad1ad20a5eb2173bbfefc0bd43158fe08480..c2164394ebdff2c61ffdcf7dba83b95e27527dcf 100644
--- a/gpu/config/gpu_info_collector_mac.mm
+++ b/gpu/config/gpu_info_collector_mac.mm
@@ -190,7 +190,7 @@ bool CollectBasicGraphicsInfo(GPUInfo* gpu_info) {
   int32 model_major = 0, model_minor = 0;
   base::mac::ParseModelIdentifier(base::mac::GetModelIdentifier(),
                                   &model_name, &model_major, &model_minor);
-  ReplaceChars(model_name, " ", "_", &gpu_info->machine_model);
+  base::ReplaceChars(model_name, " ", "_", &gpu_info->machine_model);
   gpu_info->machine_model += " " + base::IntToString(model_major) +
                              "." + base::IntToString(model_minor);