Revert 264167 "Sniff MIME type for files which have unknown exte..."

trunk/src/apps/launcher.cc

Index: trunk/src/apps/launcher.cc
===================================================================
--- trunk/src/apps/launcher.cc	(revision 264191)
+++ trunk/src/apps/launcher.cc	(working copy)
@@ -29,8 +29,6 @@
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/manifest_handlers/kiosk_mode_info.h"
-#include "net/base/filename_util.h"
-#include "net/base/mime_sniffer.h"
 #include "net/base/mime_util.h"
 #include "net/base/net_util.h"
 #include "url/gurl.h"
@@ -183,21 +181,8 @@
     }
 
     std::string mime_type;
-    if (!net::GetMimeTypeFromFile(file_path_, &mime_type)) {
-      // If MIME type of the file can't be determined by its path,
-      // try to sniff it by its content.
-      std::vector<char> content(net::kMaxBytesToSniff);
-      int bytes_read = base::ReadFile(file_path_, &content[0], content.size());
-      if (bytes_read >= 0) {
-        net::SniffMimeType(&content[0],
-                           bytes_read,
-                           net::FilePathToFileURL(file_path_),
-                           std::string(),  // type_hint (passes no hint)
-                           &mime_type);
-      }
-      if (mime_type.empty())
-        mime_type = kFallbackMimeType;
-    }
+    if (!net::GetMimeTypeFromFile(file_path_, &mime_type))
+      mime_type = kFallbackMimeType;
 
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
             &PlatformAppPathLauncher::LaunchWithMimeType, this, mime_type));