Make NamedProxyLauncher connections more robust to errors. It now clears the channel file before launching Chrome and has a timeout when waiting for the file to be created.
Make NamedProxyLauncher connections more robust to errors. It now clears the channel file before launching Chrome and has a timeout when waiting for the file to be created.

BUG=66414
TEST=Should see no change in ui_tests. FLAKY_BasicNamedInterface may become non-flaky.

Review URL: http://codereview.chromium.org/6546030

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@76080 0039d316-1c4b-4281-b951-d872f2087c98

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