Remove override_build_date gn arg.

As far as I can tell, this is unused.

Bug: 489490
Change-Id: I729acb5d1f50ad56848e00b3c2b771e1074dba00
Reviewed-on: https://chromium-review.googlesource.com/1160777Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580326}

base/BUILD.gn

@@ -34,11 +34,6 @@ import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 
 declare_args() {
-  # Override this value to give a specific build date.
-  # See //base/build_time.cc and //build/write_build_date_header.py for more
-  # details and the expected format.
-  override_build_date = "N/A"
-
   # Indicates if the Location object contains the source code information
   # (file, function, line). False means only the program counter (and currently
   # file name) is saved.
@@ -2751,10 +2746,6 @@ action("build_date") {
   } else {
     args += [ "default" ]
   }
-
-  if (override_build_date != "N/A") {
-    args += [ override_build_date ]
-  }
 }
 
 if (enable_nocompile_tests) {

build/write_build_date_header.py

@@ -78,25 +78,17 @@ def main():
   argument_parser.add_argument('output_file', help='The file to write to')
   argument_parser.add_argument(
       'build_type', help='The type of build', choices=('official', 'default'))
-  argument_parser.add_argument(
-      'build_date_override', nargs='?',
-      help='Optional override for the build date. Format must be '
-           '\'Mmm DD YYYY HH:MM:SS\'')
   args = argument_parser.parse_args()
 
-  if args.build_date_override:
-    # Format is expected to be "Mmm DD YYYY HH:MM:SS".
-    build_date = args.build_date_override
-  else:
-    now = datetime.datetime.utcnow()
-    if now.hour < 5:
-      # The time is locked at 5:00 am in UTC to cause the build cache
-      # invalidation to not happen exactly at midnight. Use the same calculation
-      # as the day before.
-      # See //base/build_time.cc.
-      now = now - datetime.timedelta(days=1)
-    now = datetime.datetime(now.year, now.month, now.day, 5, 0, 0)
-    build_date = GetBuildDate(args.build_type, now)
+  now = datetime.datetime.utcnow()
+  if now.hour < 5:
+    # The time is locked at 5:00 am in UTC to cause the build cache
+    # invalidation to not happen exactly at midnight. Use the same calculation
+    # as the day before.
+    # See //base/build_time.cc.
+    now = now - datetime.timedelta(days=1)
+  now = datetime.datetime(now.year, now.month, now.day, 5, 0, 0)
+  build_date = GetBuildDate(args.build_type, now)
 
   output = ('// Generated by //build/write_build_date_header.py\n'
            '#ifndef BUILD_DATE\n'