Cleanup: Remove most enable_extensions logic in extensions code.

extensions/shell/browser/shell_browser_main_parts.cc

Index: extensions/shell/browser/shell_browser_main_parts.cc
diff --git a/extensions/shell/browser/shell_browser_main_parts.cc b/extensions/shell/browser/shell_browser_main_parts.cc
index e9708f1772d401fb09e7a5ee80850a33eee8ebd1..3387311031f338c879060ab4e0763d4e0279cee3 100644
--- a/extensions/shell/browser/shell_browser_main_parts.cc
+++ b/extensions/shell/browser/shell_browser_main_parts.cc
@@ -8,6 +8,7 @@
 #include "base/run_loop.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/omaha_query_params/omaha_query_params.h"
+#include "components/storage_monitor/storage_monitor.h"
 #include "content/public/browser/child_process_security_policy.h"
 #include "content/public/browser/context_factory.h"
 #include "content/public/common/result_codes.h"
@@ -34,10 +35,6 @@
 #include "ui/base/ime/input_method_initializer.h"
 #include "ui/base/resource/resource_bundle.h"
 
-#if !defined(OS_ANDROID) && !defined(OS_IOS)
-#include "components/storage_monitor/storage_monitor.h"
-#endif
-
 #if defined(OS_CHROMEOS)
 #include "chromeos/audio/cras_audio_handler.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
@@ -120,9 +117,7 @@ void ShellBrowserMainParts::PreMainMessageLoopRun() {
 
   aura::Env::GetInstance()->set_context_factory(content::GetContextFactory());
 
-#if !defined(OS_ANDROID) && !defined(OS_IOS)
   storage_monitor::StorageMonitor::Create();
-#endif
 
   desktop_controller_.reset(browser_main_delegate_->CreateDesktopController());
 
@@ -215,9 +210,7 @@ void ShellBrowserMainParts::PostMainMessageLoopRun() {
 
   desktop_controller_.reset();
 
-#if !defined(OS_ANDROID) && !defined(OS_IOS)
   storage_monitor::StorageMonitor::Destroy();
-#endif
 }
 
 void ShellBrowserMainParts::PostDestroyThreads() {