Revert r156303 as non-Aura Metro mode is gone

base/win/metro.cc

Index: base/win/metro.cc
diff --git a/base/win/metro.cc b/base/win/metro.cc
index c78cc0946ee2c42cc323ce53ae99a1076b35d48e..1911f906b8ead3bc9cdb39eb10ddeb9f06f7bbfc 100644
--- a/base/win/metro.cc
+++ b/base/win/metro.cc
@@ -12,10 +12,6 @@
 namespace base {
 namespace win {
 
-namespace {
-bool g_should_tsf_aware_required = false;
-}
-
 HMODULE GetMetroModule() {
   const HMODULE kUninitialized = reinterpret_cast<HMODULE>(1);
   static HMODULE metro_module = kUninitialized;
@@ -73,35 +69,7 @@ bool IsProcessImmersive(HANDLE process) {
 bool IsTSFAwareRequired() {
   // Although this function is equal to IsMetroProcess at this moment,
   // Chrome for Win7 and Vista may support TSF in the future.
-  return g_should_tsf_aware_required || IsMetroProcess();
-}
-
-void SetForceToUseTSF() {
-  g_should_tsf_aware_required = true;
-
-  // Since Windows 8 Metro mode disables CUAS (Cicero Unaware Application
-  // Support) via ImmDisableLegacyIME API, Chrome must be fully TSF-aware on
-  // Metro mode. For debugging purposes, explicitly call ImmDisableLegacyIME so
-  // that one can test TSF functionality even on Windows 8 desktop mode. Note
-  // that CUAS cannot be disabled on Windows Vista/7 where ImmDisableLegacyIME
-  // is not available.
-  typedef BOOL (* ImmDisableLegacyIMEFunc)();
-  HMODULE imm32 = ::GetModuleHandleA("imm32.dll");
-  if (imm32 == NULL)
-    return;
-
-  ImmDisableLegacyIMEFunc imm_disable_legacy_ime =
-      reinterpret_cast<ImmDisableLegacyIMEFunc>(
-          ::GetProcAddress(imm32, "ImmDisableLegacyIME"));
-
-  if (imm_disable_legacy_ime == NULL) {
-    // Unsupported API, just do nothing.
-    return;
-  }
-
-  if (!imm_disable_legacy_ime()) {
-    DVLOG(1) << "Failed to disable legacy IME.";
-  }
+  return IsMetroProcess();
 }
 
 wchar_t* LocalAllocAndCopyString(const string16& src) {