Implement InspectorClient's Settings API.

This CL implements InspectorClient's API for reading / writing inspector settings. Here is how this is done: 

- inspector_client_impl.cc caches / serializes preferences into raw strings. It supports all kinds of settings except for string vector. I did not implement it since a) it requires more escaping b) I think we should get rid of it upstream. It then passes serialized settings string over IPC.
- There is a dedicated IPC message called UpdateInspectorSettings that takes care of settings update.

Two things I don't like: 
1) reading settings and writing settings follow different paths: WebPreferences interface for read, delegate -> IPC for write. WebPreferences on read is used since these settings are needed very early in the page cycle. delegate -> IPC on write is the only option.
2) this looks like too much code on the Chrome side for functionality like this. Is there a more generic way of settings and persisting WebKit's preferences in Chrome? Should there be one?

Review URL: http://codereview.chromium.org/119041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17473 0039d316-1c4b-4281-b951-d872f2087c98

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