Remove the size limit for sending Pepper DidChangeView messages.

Currently if the plugin element exceeds a certain size, no DidChangeView
messages will be sent to the plugin. This is problematic if you really
do have a very large plugin element. Plugins should gracefully handle
large sizes.

For reference, this check was added in
https://code.google.com/p/chromium/issues/detail?id=122657. We will
have to monitor crashes to determine whether we need to take action in
Flash or other plugins.

BUG=

Review URL: https://codereview.chromium.org/55703002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234188 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234188