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Also converts some internal std::string usage to WebCore::String.
Note: copying WebString to WebCore::String is very cheap (just
increments a reference count). 

The ugly WebStringToString and StringToWebString calls inside the
devtools implementation are temporary.  Once this code moves into
the WebKit API implementation, those methods will go away.

I thought about changing the devtools IPCs to use string16 instead
of std::string because that would avoid the UTF8 conversions.  I'm
not sure if that is worth it though given that UTF16 would increase
the amount of data being sent over IPC.  I figure this is something
that could be studied later.

R=pfeldman
BUG=24597
TEST=none

Review URL: http://codereview.chromium.org/264077

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@29286 0039d316-1c4b-4281-b951-d872f2087c98