GN: Use implicit dependency for binary input deps

tools/gn/ninja_target_writer_unittest.cc

Index: tools/gn/ninja_target_writer_unittest.cc
diff --git a/tools/gn/ninja_target_writer_unittest.cc b/tools/gn/ninja_target_writer_unittest.cc
index ccb9c7a3cebb81b4d76c6550bc918552ca1a8348..55bbde05db5aaa9bf054076138897b0cbe81d8f1 100644
--- a/tools/gn/ninja_target_writer_unittest.cc
+++ b/tools/gn/ninja_target_writer_unittest.cc
@@ -85,12 +85,9 @@ TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDep) {
     OutputFile dep =
         writer.WriteInputDepsStampAndGetDep(std::vector<const Target*>());
 
-    // Since there is more than one dependency, a stamp file will be returned
-    // and the rule for the stamp file will be written to the stream.
-    EXPECT_EQ("obj/foo/target.inputdeps.stamp", dep.value());
-    EXPECT_EQ("build obj/foo/target.inputdeps.stamp: stamp "
-                  "../../foo/input.txt obj/foo/base.stamp\n",
-              stream.str());
+    // Since there is only one dependency, a stamp file will be returned
+    // directly without writing any additional rules.
+    EXPECT_EQ("obj/foo/base.stamp", dep.value());
   }
 
   // Input deps for action which should depend on the base since its a hard dep