Fixed "blocking io" from FixupPath on UI thread.

content/shell/browser/shell_browser_main_parts.cc

Index: content/shell/browser/shell_browser_main_parts.cc
diff --git a/content/shell/browser/shell_browser_main_parts.cc b/content/shell/browser/shell_browser_main_parts.cc
index efc029e8bee9e81db2e9e64cc858f92ab802a262..d0a1974ff0a29d1695f6a672ae343931134efe5d 100644
--- a/content/shell/browser/shell_browser_main_parts.cc
+++ b/content/shell/browser/shell_browser_main_parts.cc
@@ -8,6 +8,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
+#include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
@@ -64,7 +65,8 @@ GURL GetStartupURL() {
   if (url.is_valid() && url.has_scheme())
     return url;
 
-  return net::FilePathToFileURL(base::FilePath(args[0]));
+  return net::FilePathToFileURL(

[davidben, 2015/04/22 01:09:18]

This change ought to be mirrored in
https://code.google.com/p/chromium/codesearch#chromium/src/chromecast/browser...

Probably also here, though it seems to be a random manual test.
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/pri...

+      base::MakeAbsoluteFilePath(base::FilePath(args[0])));

[Peter Kasting, 2015/04/21 22:34:05]

Nit: This would probably be safer as:

  base::FilePath file_path(base::MakeAbsoluteFilePath(base::FilePath(args[0])));
  return file_path.empty() ? GURL() : net::FilePathToFileURL(file_path);

[eugenebng, 2015/04/23 12:01:52]

I used FilePathToFileURL(base::MakeAbsoluteFilePath(...)) because this solution
is already used in content_shell. 
If code returning empty URL for empty path is better, wouldn't it be good to
change that everywhere in conntent_shell as another issue?   

 }
 
 base::StringPiece PlatformResourceProvider(int key) {