Remove stray platform_file.h from chrome and components

chrome/browser/devtools/devtools_file_system_indexer.cc

Index: chrome/browser/devtools/devtools_file_system_indexer.cc
diff --git a/chrome/browser/devtools/devtools_file_system_indexer.cc b/chrome/browser/devtools/devtools_file_system_indexer.cc
index 7e0d6fcbd04b67273fbce0939f3d9d363758a76a..edeeca108b1fa67de8d071edd5581fb427c43984 100644
--- a/chrome/browser/devtools/devtools_file_system_indexer.cc
+++ b/chrome/browser/devtools/devtools_file_system_indexer.cc
@@ -13,7 +13,6 @@
 #include "base/files/file_util_proxy.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
-#include "base/platform_file.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_thread.h"
 
@@ -24,8 +23,6 @@ using base::FilePath;
 using base::Time;
 using base::TimeDelta;
 using base::TimeTicks;
-using base::PassPlatformFile;
-using base::PlatformFile;
 using content::BrowserThread;
 using std::map;
 using std::set;