Revert "build cachetool on windows"

This reverts commit 35e625a4.

Reason for revert:
I think this caused compile failure:
https://ci.chromium.org/p/chromium/builders/ci/win32-archive-rel/9728?blamelist=1#blamelist-tab

Original change's description:
> build cachetool on windows
> 
> The only issue seems to be handling arguments :)
> 
> Change-Id: I1574bf3fdb50b15c9599adb63395c83bc28681a0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2018125
> Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
> Commit-Queue: Jeremy Apthorp <jeremya@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#737401}

TBR=rsleevi@chromium.org,jeremya@chromium.org

Change-Id: I5665cd7302b6f6ade7a48a7c278b15fae5a3aa29
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033341Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737410}

net/BUILD.gn

@@ -2434,7 +2434,7 @@ if (use_external_gssapi) {
   }
 }
 
-if (is_linux || is_mac || is_win) {
+if (is_linux || is_mac) {
   executable("cachetool") {
     testonly = true
     sources = [ "tools/cachetool/cachetool.cc" ]

net/tools/cachetool/cachetool.cc

@@ -15,13 +15,11 @@
 #include "base/message_loop/message_pump_type.h"
 #include "base/run_loop.h"
 #include "base/stl_util.h"
-#include "base/strings/utf_string_conversions.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/stringprintf.h"
 #include "base/task/single_thread_task_executor.h"
 #include "base/task/thread_pool/thread_pool_instance.h"
-#include "build/build_config.h"
 #include "net/base/io_buffer.h"
 #include "net/base/test_completion_callback.h"
 #include "net/disk_cache/disk_cache.h"
@@ -173,11 +171,7 @@ class ProgramArgumentCommandMarshal final : public CommandMarshal {
   // Implements CommandMarshal.
   std::string ReadString() override {
     if (args_id_ < command_line_args_.size())
-#if defined(OS_WIN)
-      return base::WideToUTF8(command_line_args_[args_id_++]);
-#else
       return command_line_args_[args_id_++];
-#endif
     if (!has_failed())
       ReturnFailure("Command line arguments to short.");
     return "";
@@ -700,11 +694,7 @@ int main(int argc, char* argv[]) {
   base::ThreadPoolInstance::CreateAndStartWithDefaultParams("cachetool");
 
   base::FilePath cache_path(args[0]);
-#if defined(OS_WIN)
-  std::string cache_backend_type(base::WideToUTF8(args[1]));
-#else
   std::string cache_backend_type(args[1]);
-#endif
 
   net::BackendType backend_type;
   if (cache_backend_type == "simple") {