Don't forcibly set our network state to NETWORK_LOADING after media initializes.
Don't forcibly set our network state to NETWORK_LOADING after media initializes.

We already set the network state to NETWORK_LOADING before we kick off initialization.  Furthermore, we may end up caching the entire media resource and set our network state to NETWORK_IDLE in which case we really don't want to switch back to NETWORK_LOADING.

BUG=25185
TEST=covered by layout tests

Review URL: http://codereview.chromium.org/1518013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@43441 0039d316-1c4b-4281-b951-d872f2087c98

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