Revert "Grit: Avoid rebuilding all pak files when ID ranges do not change"

This reverts commit 7eefdcbf.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 738454 as the
culprit for failures in the build cycles as shown on:
https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzdlZWZkY2JmNjNjZDNjOGMzYmNhZTZkNmQ4OTQ2ODM4OWFmOGRiNWMM

Sample Failed Build: https://ci.chromium.org/b/8889318408391750976

Sample Failed Step: compile

Original change's description:
> Grit: Avoid rebuilding all pak files when ID ranges do not change
> 
> We are now generating ID ranges for .grd files as part of the build. The
> tool was already smart enough to leave padding for each range so that
> the ranges would not change for every single resource added / removed.
> However, since it was unconditinoally writing the resource_ids file,
> ninja was considering all grit targets as stale even when ID ranges did
> not change.
> 
> We now write the file only when it is changing so that ninja will not
> consider grit targets stale in the did-not-change case.
> 
> Bug: 979886
> Change-Id: Ib38620e1be097b31ec876be9b07172a7ff945c07
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036528
> Auto-Submit: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Samuel Huang <huangs@chromium.org>
> Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#738454}


Change-Id: I5e0e2bc30ae2a10d5fafb74aef9575c6991573c9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 979886
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2038068
Cr-Commit-Position: refs/heads/master@{#738463}

tools/grit/grit/tool/update_resource_ids/__init__.py

@@ -69,9 +69,7 @@ from __future__ import print_function
 import collections
 import getopt
 import os
-import shutil
 import sys
-import tempfile
 
 from grit.tool import interface
 from grit.tool.update_resource_ids import assigner, common, parser, reader
@@ -108,21 +106,12 @@ def _MultiReplace(data, repl):
   return ''.join(res)
 
 
-def _WriteFileIfChanged(output, new_data):
-  if not output:
+def _WriteFile(output, new_data):
+  if output:
+    with open(output, 'wt') as fh:
+      fh.write(new_data)
+  else:
     sys.stdout.write(new_data)
-    return
-
-  # Avoid touching outputs if file contents has not changed so that ninja
-  # does not rebuild dependent when not necessary.
-  if os.path.exists(output) and _ReadData(output)[0] == new_data:
-    return
-
-  # Write to a temporary file to ensure atomic changes.
-  with tempfile.NamedTemporaryFile('wt', delete=False) as f:
-    f.write(new_data)
-    f.flush()
-    shutil.move(f.name, output)
 
 
 class _Args:
@@ -299,8 +288,8 @@ Other options:
       header.append('# Edit %s instead.' % rel_input_dir)
       header.append('#' * 80)
       new_data = '\n'.join(header + ['']) + new_data
-    _WriteFileIfChanged(args.output, new_data)
+    _WriteFile(args.output, new_data)
 
     if args.depfile:
       deps_data = '{}: {}'.format(args.output, ' '.join(sorted(seen_files)))
-      _WriteFileIfChanged(args.depfile, deps_data)
+      _WriteFile(args.depfile, deps_data)