Revert 174880 due to compilation error in pdf_browsertest.cc

Revert 174880 due to compilation error in pdf_browsertest.cc
> Change ExecuteJavaScript* helper functions in browser_test_utils.{h,cc}
> to take std::string (UTF-8) instead of std::wstring.  This seems to help
> simplify callsites considerably.
> 
> TBR=jam@chromium.org
> BUG=none
> 
> 
> Review URL: https://chromiumcodereview.appspot.com/11728003

TBR=darin@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=174947

[gavinp, 2013-01-03 16:34:50]

On 2013/01/03 12:16:10, dharani1 wrote:

This is an important type of change to get right. This issue changed a very
important interface, and it would have been great to catch the issue in Chrome,
and/or to fix Chrome before rolling it forward to this rev of Chrome...

Instead, by reverting it, we have a second patch that makes a massive churn on
the code base, and requires lots of pending patches to be fixed so they compile.
And of course, there's the promise of a third such change coming shortly...

[gavinp, 2013-01-03 16:51:01]

AHA, my snarky comment above is silly. I didn't look carefully enough: this was
on a branch.

[gavinp, 2013-01-03 16:51:03]

AHA, my snarky comment above is silly. I didn't look carefully enough: this was
on a branch.