Revert "Disable Android IMEs according to given ImeInfo."

This reverts commit 2687587b.

Reason for revert: This triggers a use of initialized value on the msan bots. I believe you forgot to initialize is_removing_imm_entry_

https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8929963931985091872/+/steps/unit_tests/0/logs/ArcInputMethodManagerServiceTest.EnableIme/0

==14387==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x5638655272d9 in arc::ArcInputMethodManagerService::ImeMenuListChanged() ./../../chrome/browser/chromeos/arc/input_method_manager/arc_input_method_manager_service.cc:394:7
    #1 0x56385b307d20 in arc::ArcInputMethodManagerServiceTest_EnableIme_Test::TestBody() ./../../chrome/browser/chromeos/arc/input_method_manager/arc_input_method_manager_service_unittest.cc:313:14
    #2 0x56385dbb3cb2 in HandleExceptionsInMethodIfSupported<testing::Test, void> ./../../third_party/googletest/src/googletest/src/gtest.cc:0:0
    #3 0x56385dbb3cb2 in testing::Test::Run() ./../../third_party/googletest/src/googletest/src/gtest.cc:2522:0
    #4 0x56385dbb7a6b in testing::TestInfo::Run() ./../../third_party/googletest/src/googletest/src/gtest.cc:2698:11
    #5 0x56385dbb9559 in testing::TestCase::Run() ./../../third_party/googletest/src/googletest/src/gtest.cc:2816:28
    #6 0x56385dbf2614 in testing::internal::UnitTestImpl::RunAllTests() ./../../third_party/googletest/src/googletest/src/gtest.cc:5182:43
    #7 0x56385dbf0ee7 in HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool> ./../../third_party/googletest/src/googletest/src/gtest.cc:0:0
    #8 0x56385dbf0ee7 in testing::UnitTest::Run() ./../../third_party/googletest/src/googletest/src/gtest.cc:4791:0
    #9 0x56386b81af20 in RUN_ALL_TESTS ./../../third_party/googletest/src/googletest/include/gtest/gtest.h:2333:46
    #10 0x56386b81af20 in base::TestSuite::Run() ./../../base/test/test_suite.cc:294:0
    #11 0x56386b822e8a in Run ./../../base/callback.h:99:12
    #12 0x56386b822e8a in base::(anonymous namespace)::LaunchUnitTestsInternal(base::OnceCallback<int ()>, unsigned long, int, bool, base::OnceCallback<void ()>) ./../../base/test/launcher/unit_test_launcher.cc:225:0
    #13 0x56386b822607 in base::LaunchUnitTests(int, char**, base::OnceCallback<int ()>) ./../../base/test/launcher/unit_test_launcher.cc:575:10
    #14 0x56386b7e9154 in main ./../../chrome/test/base/run_all_unittests.cc:30:10
    #15 0x7fd6f88f4f44 in __libc_start_main ??:0:0
    #16 0x5638521e2b09 in _start ??:0:0

Original change's description:
> Disable Android IMEs according to given ImeInfo.
> 
> Android IMEs can be disabled in Android side by using 'ime' command.
> This CL ensures that disabled IMEs are also disabled in Chrome OS's
> InputMethodManager.
> 
> Bug: b/119274469
> Change-Id: I46c2996a41327221470d69b778da2b7270c73cd2
> Reviewed-on: https://chromium-review.googlesource.com/c/1331294
> Reviewed-by: Yusuke Sato <yusukes@chromium.org>
> Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#607473}

TBR=yusukes@chromium.org,yhanada@chromium.org

Change-Id: I5fd93607e711cd90edc4eb0ccf656b4c82ad5555
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/119274469
Reviewed-on: https://chromium-review.googlesource.com/c/1333892Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607610}

chrome/browser/chromeos/arc/input_method_manager/arc_input_method_manager_service.cc

@@ -328,12 +328,10 @@ void ArcInputMethodManagerService::OnImeInfoChanged(
   if (!base::FeatureList::IsEnabled(kEnableInputMethodFeature))
     return;
 
-  is_removing_imm_entry_ = true;
   scoped_refptr<InputMethodManager::State> state =
       InputMethodManager::Get()->GetActiveIMEState();
   // Remove the old registered entry.
   state->RemoveInputMethodExtension(proxy_ime_extension_id_);
-  is_removing_imm_entry_ = false;
 
   // Convert ime_info_array to InputMethodDescriptors.
   InputMethodDescriptors descriptors;
@@ -365,11 +363,6 @@ void ArcInputMethodManagerService::OnImeInfoChanged(
     if (!base::ContainsValue(active_ime_list, input_method_id))
       active_ime_list.push_back(input_method_id);
   }
-  // Disable IMEs that are already disable in the container.
-  base::EraseIf(active_ime_list, [&enabled_input_method_ids](const auto& id) {
-    return chromeos::extension_ime_util::IsArcIME(id) &&
-           !base::ContainsValue(enabled_input_method_ids, id);
-  });
   profile_->GetPrefs()->SetString(prefs::kLanguageEnabledImes,
                                   base::JoinString(active_ime_list, ","));
 
@@ -389,11 +382,6 @@ void ArcInputMethodManagerService::OnConnectionClosed() {
 }
 
 void ArcInputMethodManagerService::ImeMenuListChanged() {
-  // Ignore ime menu list change while removing the old entry in
-  // |OnImeInfoChanged| not to expose temporary state to ARC++ container.
-  if (is_removing_imm_entry_)
-    return;
-
   auto* manager = chromeos::input_method::InputMethodManager::Get();
   auto new_active_ime_ids =
       manager->GetActiveIMEState()->GetActiveInputMethodIds();

chrome/browser/chromeos/arc/input_method_manager/arc_input_method_manager_service.h

@@ -119,7 +119,6 @@ class ArcInputMethodManagerService
   std::unique_ptr<ArcInputMethodManagerBridge> imm_bridge_;
   std::set<std::string> active_arc_ime_ids_;
   bool is_virtual_keyboard_shown_;
-  bool is_removing_imm_entry_;
 
   // ArcInputMethodManager installs a proxy IME to redirect IME related events
   // from/to ARC IMEs in the container. The below two variables are for the