Extensions: Split extensions utility IPC messages into its own file.

chrome/browser/download/download_target_determiner.cc

Index: chrome/browser/download/download_target_determiner.cc
diff --git a/chrome/browser/download/download_target_determiner.cc b/chrome/browser/download/download_target_determiner.cc
index e7bb16d394091497f29e49249c936900a0a26001..3060c38da3620526d69b649bdc17e53002486bd6 100644
--- a/chrome/browser/download/download_target_determiner.cc
+++ b/chrome/browser/download/download_target_determiner.cc
@@ -12,7 +12,6 @@
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_extensions.h"
 #include "chrome/browser/download/download_prefs.h"
-#include "chrome/browser/extensions/webstore_installer.h"
 #include "chrome/browser/history/history_service.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
@@ -21,12 +20,16 @@
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/download_interrupt_reasons.h"
 #include "extensions/common/constants.h"
-#include "extensions/common/feature_switch.h"
 #include "grit/generated_resources.h"
 #include "net/base/filename_util.h"
 #include "net/base/mime_util.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if defined(ENABLE_EXTENSIONS)
+#include "chrome/browser/extensions/webstore_installer.h"
+#include "extensions/common/feature_switch.h"
+#endif
+
 #if defined(ENABLE_PLUGINS)
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "content/public/browser/plugin_service.h"
@@ -762,6 +765,7 @@ bool DownloadTargetDeterminer::IsDangerousFile(PriorVisitsToReferrer visits) {
     return false;
   }
 
+#if defined(ENABLE_EXTENSIONS)
   // Extensions that are not from the gallery are considered dangerous.
   // When off-store install is disabled we skip this, since in this case, we
   // will not offer to install the extension.
@@ -770,6 +774,7 @@ bool DownloadTargetDeterminer::IsDangerousFile(PriorVisitsToReferrer visits) {
       !extensions::WebstoreInstaller::GetAssociatedApproval(*download_)) {
     return true;
   }
+#endif
 
   // Anything the user has marked auto-open is OK if it's user-initiated.
   if (download_prefs_->IsAutoOpenEnabledBasedOnExtension(virtual_path_) &&