Convert //tools to use std::unique_ptr

tools/gn/ninja_binary_target_writer_unittest.cc

Index: tools/gn/ninja_binary_target_writer_unittest.cc
diff --git a/tools/gn/ninja_binary_target_writer_unittest.cc b/tools/gn/ninja_binary_target_writer_unittest.cc
index c9b3ebef9da56d6f8c16a2148d302601f8fbe252..ca54478a0748d81a74c47fb3aebaea841070c084 100644
--- a/tools/gn/ninja_binary_target_writer_unittest.cc
+++ b/tools/gn/ninja_binary_target_writer_unittest.cc
@@ -474,7 +474,7 @@ TEST(NinjaBinaryTargetWriter, WinPrecompiledHeaders) {
   pch_settings.set_default_toolchain_label(setup.toolchain()->label());
 
   // Declare a C++ compiler that supports PCH.
-  scoped_ptr<Tool> cxx_tool(new Tool);
+  std::unique_ptr<Tool> cxx_tool(new Tool);
   TestWithScope::SetCommandForTool(
       "c++ {{source}} {{cflags}} {{cflags_cc}} {{defines}} {{include_dirs}} "
       "-o {{output}}",
@@ -485,7 +485,7 @@ TEST(NinjaBinaryTargetWriter, WinPrecompiledHeaders) {
   pch_toolchain.SetTool(Toolchain::TYPE_CXX, std::move(cxx_tool));
 
   // Add a C compiler as well.
-  scoped_ptr<Tool> cc_tool(new Tool);
+  std::unique_ptr<Tool> cc_tool(new Tool);
   TestWithScope::SetCommandForTool(
       "cc {{source}} {{cflags}} {{cflags_c}} {{defines}} {{include_dirs}} "
       "-o {{output}}",
@@ -602,7 +602,7 @@ TEST(NinjaBinaryTargetWriter, GCCPrecompiledHeaders) {
   pch_settings.set_default_toolchain_label(setup.toolchain()->label());
 
   // Declare a C++ compiler that supports PCH.
-  scoped_ptr<Tool> cxx_tool(new Tool);
+  std::unique_ptr<Tool> cxx_tool(new Tool);
   TestWithScope::SetCommandForTool(
       "c++ {{source}} {{cflags}} {{cflags_cc}} {{defines}} {{include_dirs}} "
       "-o {{output}}",
@@ -614,7 +614,7 @@ TEST(NinjaBinaryTargetWriter, GCCPrecompiledHeaders) {
   pch_toolchain.ToolchainSetupComplete();
 
   // Add a C compiler as well.
-  scoped_ptr<Tool> cc_tool(new Tool);
+  std::unique_ptr<Tool> cc_tool(new Tool);
   TestWithScope::SetCommandForTool(
       "cc {{source}} {{cflags}} {{cflags_c}} {{defines}} {{include_dirs}} "
       "-o {{output}}",