chrome/browser/extensions: Always specify thread affinity when posting tasks

*** Note: There is no behavior change from this patch. ***

The PostTask APIs will shortly be changed to require all tasks to explicitly
specify their thread affinity, i.e., whether the task should run on the thread
pool or a specific named thread such as a BrowserThread. This patch updates all
call sites with thread affinity annotation. We also remove the "WithTraits"
suffix to make the call sites more readable.

Before:

    // Thread pool task.
    base::PostTaskWithTraits(FROM_HERE, {...}, ...);

    // UI thread task.
    base::PostTaskWithTraits(FROM_HERE, {BrowserThread::UI, ...}, ...);

After:

    // Thread pool task.
    base::PostTask(FROM_HERE, {base::ThreadPool(), ...}, ...);

    // UI thread task.
    base::PostTask(FROM_HERE, {BrowserThread::UI, ...}, ...);

This patch was semi-automatically prepared with these steps:

    1. Patch in https://chromium-review.googlesource.com/c/chromium/src/+/1635827
       to make thread affinity a build-time requirement.
    2. Run an initial pass with a clang rewriter:
       https://chromium-review.googlesource.com/c/chromium/src/+/1635623
    3. ninja -C out/Debug | grep 'requested here' | cut -d: -f1-3 | sort | \
           uniq > errors.txt
    4. while read line; do
         f=$(echo $line | cut -d: -f 1)
         r=$(echo $line | cut -d: -f 2)
         c=$(echo $line | cut -d: -f 3)
         sed -i "${r}s/./&base::ThreadPool(),/$c" $f
       done < errors.txt
    5. GOTO 3 until build succeeds.
    6. Remove the "WithTraits" suffix from task API call sites:

       $ tools/git/mffr.py -i <(cat <<EOF
       [
         ["PostTaskWithTraits",                            "PostTask"],
         ["PostDelayedTaskWithTraits",                     "PostDelayedTask"],
         ["PostTaskWithTraitsAndReply",                    "PostTaskAndReply"],
         ["CreateTaskRunnerWithTraits",                    "CreateTaskRunner"],
         ["CreateSequencedTaskRunnerWithTraits",           "CreateSequencedTaskRunner"],
         ["CreateUpdateableSequencedTaskRunnerWithTraits", "CreateUpdateableSequencedTaskRunner"],
         ["CreateSingleThreadTaskRunnerWithTraits",        "CreateSingleThreadTaskRunner"],
         ["CreateCOMSTATaskRunnerWithTraits",              "CreateCOMSTATaskRunner"]
       ]
       EOF
       )

This CL was uploaded by git cl split.

[email protected]

Bug: 968047
Change-Id: I2082e38973c90b49627bea4f27f7e00550f1a5ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729221
Auto-Submit: Sami Kyöstilä <[email protected]>
Reviewed-by: Devlin <[email protected]>
Reviewed-by: Asanka Herath <[email protected]>
Commit-Queue: Sami Kyöstilä <[email protected]>
Cr-Commit-Position: refs/heads/master@{#683235}
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 8e931b2a..84e0ec8 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -1848,10 +1848,9 @@
       }
 
       process_map->RemoveAllFromProcess(process->GetID());
-      base::PostTaskWithTraits(
-          FROM_HERE, {BrowserThread::IO},
-          base::BindOnce(&InfoMap::UnregisterAllExtensionsInProcess,
-                         system_->info_map(), process->GetID()));
+      base::PostTask(FROM_HERE, {BrowserThread::IO},
+                     base::BindOnce(&InfoMap::UnregisterAllExtensionsInProcess,
+                                    system_->info_map(), process->GetID()));
       break;
     }
     case chrome::NOTIFICATION_PROFILE_DESTRUCTION_STARTED: {