Increase size limit of Me2Me Linux virtual desktop

People are using bigger and bigger monitors these days! This change only
makes a difference when RANDR-enabled Xvfb is used.

NOTRY=true

Review URL: https://codereview.chromium.org/341653004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277967 0039d316-1c4b-4281-b951-d872f2087c98

remoting/host/linux/linux_me2me_host.py

@@ -42,7 +42,7 @@ DEFAULT_SIZES_ENV_VAR = "CHROME_REMOTE_DESKTOP_DEFAULT_DESKTOP_SIZES"
 # with large or multiple monitors. This is a comma-separated list of
 # resolutions that will be made available if the X server supports RANDR. These
 # defaults can be overridden in ~/.profile.
-DEFAULT_SIZES = "1600x1200,3840x1600"
+DEFAULT_SIZES = "1600x1200,3840x2560"
 
 # If RANDR is not available, use a smaller default size. Only a single
 # resolution is supported in this case.