Revert "Specify deps format for actions"

This reverts commit 7d9b8111a2e0c31c429a064f0480f16bb8b51e0f.

Reason for revert: Breaks backward compatibility with Ninja 1.8 which Chrome currently requires.

Original change's description:
> Specify deps format for actions
> 
> Setting deps format is necessary for Ninja to store the depfile in its
> internal dependency database. This can significantly speed up loading
> for large dependency files, which can be the case for custom language
> support, e.g. Go or Dart in Fuchsia, where we emit large depfiles from
> actions. This also enables the use of `ninja -t deps` tool for custom
> actions.
> 
> We hardcode the format to gcc since the documentation for depfile
> already explicitly specifies that "format is that of a Makefile".
> 
> Change-Id: Iddaad90d6c1dcf0de40b0ed8fa005ac9c5b45bd6
> Reviewed-on: https://gn-review.googlesource.com/c/gn/+/8540
> Reviewed-by: Brett Wilson <brettw@chromium.org>
> Commit-Queue: Petr Hosek <phosek@google.com>

TBR=phosek@google.com,brettw@chromium.org,brettw@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I4ce30794acfe0445e253719cd6c2232e296d5999
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/8580
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Brett Wilson <brettw@chromium.org>

src/gn/ninja_action_target_writer.cc

diff --git a/src/gn/ninja_action_target_writer.cc b/src/gn/ninja_action_target_writer.cc
index 842eb17..bb78254 100644
--- a/src/gn/ninja_action_target_writer.cc
+++ b/src/gn/ninja_action_target_writer.cc
@@ -75,7 +75,6 @@
       out_ << "  depfile = ";
       WriteDepfile(SourceFile());
       out_ << std::endl;
-      out_ << "  deps = gcc" << std::endl;
     }
     if (target_->action_values().pool().ptr) {
       out_ << "  pool = ";
@@ -207,7 +206,6 @@
       out_ << "  depfile = ";
       WriteDepfile(sources[i]);
       out_ << std::endl;
-      out_ << "  deps = gcc" << std::endl;
     }
     if (target_->action_values().pool().ptr) {
       out_ << "  pool = ";

src/gn/ninja_action_target_writer_unittest.cc

diff --git a/src/gn/ninja_action_target_writer_unittest.cc b/src/gn/ninja_action_target_writer_unittest.cc
index 9efebff..d217ab2 100644
--- a/src/gn/ninja_action_target_writer_unittest.cc
+++ b/src/gn/ninja_action_target_writer_unittest.cc
@@ -286,12 +286,10 @@
       " | obj/foo/bar.inputdeps.stamp\n"
       "  source_name_part = input1\n"
       "  depfile = gen/input1.d\n"
-      "  deps = gcc\n"
       "build input2.out: __foo_bar___rule ../../foo/input2.txt"
       " | obj/foo/bar.inputdeps.stamp\n"
       "  source_name_part = input2\n"
       "  depfile = gen/input2.d\n"
-      "  deps = gcc\n"
       "\n"
       "build obj/foo/bar.stamp: stamp input1.out input2.out\n";
   EXPECT_EQ(expected_linux, out.str());