Add "dangerous download" view on OS X, for now for dmg files. Also fix download item layout.

chrome/browser/download/download_manager.cc

Index: chrome/browser/download/download_manager.cc
diff --git a/chrome/browser/download/download_manager.cc b/chrome/browser/download/download_manager.cc
index 9c1cb1197d6e6228a697fa19433407500d2cf3bd..a00c115b252e8845fb825acb220dd88f3b4ecf39 100644
--- a/chrome/browser/download/download_manager.cc
+++ b/chrome/browser/download/download_manager.cc
@@ -19,6 +19,7 @@
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_file.h"
+#include "chrome/browser/download/download_util.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extensions_service.h"
 #include "chrome/browser/profile.h"
@@ -46,11 +47,6 @@
 #include "base/win_util.h"
 #endif
 
-#if !defined(OS_MACOSX)
-// Used for initializing the list of dangerous extensions. We don't support it
-// yet on mac.
-#include "chrome/browser/download/download_util.h"
-#endif
 
 #if defined(OS_LINUX)
 #include <gtk/gtk.h>
@@ -528,10 +524,8 @@ bool DownloadManager::Init(Profile* profile) {
   file_loop_->PostTask(FROM_HERE, NewRunnableFunction(
       CreateDirectoryPtr, download_path()));
 
-#if defined(OS_WIN) || defined(OS_LINUX)
   // We use this to determine possibly dangerous downloads.
   download_util::InitializeExeTypes(&exe_types_);
-#endif
 
   // We store any file extension that should be opened automatically at
   // download completion in this pref.
@@ -1335,21 +1329,16 @@ bool DownloadManager::IsExecutableMimeType(const std::string& mime_type) {
 }
 
 bool DownloadManager::IsExecutable(const FilePath::StringType& extension) {
-#if defined(OS_MACOSX)
-  // We don't have dangerous download support on mac yet.
-  return false;
-#else
   if (!IsStringASCII(extension))
     return false;
 #if defined(OS_WIN)
   std::string ascii_extension = WideToASCII(extension);
-#elif defined(OS_LINUX)
+#elif defined(OS_POSIX)
   std::string ascii_extension = extension;
 #endif
   StringToLowerASCII(&ascii_extension);
 
   return exe_types_.find(ascii_extension) != exe_types_.end();
-#endif  // !defined(OS_MACOSX)
 }
 
 void DownloadManager::ResetAutoOpenFiles() {