Move PathIsWritable, DirectoryExists, ContentsEqual, and TextContentsEqual to the base namespace.

content/renderer/gpu/gpu_benchmarking_extension.cc

Index: content/renderer/gpu/gpu_benchmarking_extension.cc
diff --git a/content/renderer/gpu/gpu_benchmarking_extension.cc b/content/renderer/gpu/gpu_benchmarking_extension.cc
index fbae5dab332ac3547bd97aa483223b903a93f2ee..43d557dec90e4f807b04a28bb2e6b46475591424 100644
--- a/content/renderer/gpu/gpu_benchmarking_extension.cc
+++ b/content/renderer/gpu/gpu_benchmarking_extension.cc
@@ -348,7 +348,7 @@ class GpuBenchmarkingWrapper : public v8::Extension {
     base::FilePath dirpath(
         base::FilePath::StringType(*dirname, *dirname + dirname.length()));
     if (!file_util::CreateDirectory(dirpath) ||
-        !file_util::PathIsWritable(dirpath)) {
+        !base::PathIsWritable(dirpath)) {
       std::string msg("Path is not writable: ");
       msg.append(dirpath.MaybeAsASCII());
       v8::ThrowException(v8::Exception::Error(