[Fuchsia] Write net-test-server-config to /tmp

Previuously net-test-server-config was written to /data/shared,
which is then mapped to /test-shared in the test launcher. The problem
was that this approach breaks when test launcher is not used (i.e. with
--single-process-tests flag). Updated runner scripts to copy the file to
/tmp. This approach is more consistent with other platforms and doesn't
require any special logic in the test launcher.

Change-Id: I5377eda57a0524b02e7ce419a5930ff16087a2e6
Reviewed-on: https://chromium-review.googlesource.com/c/1374456Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616052}

base/test/launcher/test_launcher.cc

@@ -378,21 +378,6 @@ int LaunchChildTestProcessWithOptions(const CommandLine& command_line,
                                      base::File::FLAG_DELETE_ON_CLOSE))
                       .release()});
 
-  // The test launcher can use a shared data directory for providing tests with
-  // files deployed at runtime. The files are located under the directory
-  // "/data/shared". They will be mounted at "/test-shared" under the child
-  // process' namespace.
-  const base::FilePath kSharedDataSourcePath("/data/shared");
-  const base::FilePath kSharedDataTargetPath("/test-shared");
-  if (base::PathExists(kSharedDataSourcePath)) {
-    zx::handle shared_directory_handle = base::fuchsia::GetHandleFromFile(
-        base::File(kSharedDataSourcePath,
-                   base::File::FLAG_OPEN | base::File::FLAG_READ |
-                       base::File::FLAG_DELETE_ON_CLOSE));
-    new_options.paths_to_transfer.push_back(
-        {kSharedDataTargetPath, shared_directory_handle.release()});
-  }
-
 #endif  // defined(OS_FUCHSIA)
 
 #if defined(OS_LINUX)

build/fuchsia/net_test_server.py

@@ -130,7 +130,6 @@ def SetupTestServer(target, test_concurrency):
   }))
 
   config_file.flush()
-  target.RunCommand(['mkdir /data/shared'])
-  target.PutFile(config_file.name, '/data/shared/net-test-server-config')
+  target.PutFile(config_file.name, '/tmp/net-test-server-config')
 
   return spawning_server

net/test/spawned_test_server/remote_test_server_config.cc

@@ -28,8 +28,6 @@ base::FilePath GetTestServerConfigFilePath() {
   base::FilePath dir;
 #if defined(OS_ANDROID)
   base::PathService::Get(base::DIR_ANDROID_EXTERNAL_STORAGE, &dir);
-#elif defined(OS_FUCHSIA)
-  dir = base::FilePath("/test-shared");
 #else
   base::PathService::Get(base::DIR_TEMP, &dir);
 #endif