content: Remove odd and unused forward declaration in plugin_service_impl.h

I found this while grepping for "namespace webkit {".

BUG=None
TEST=None
TBR=sky@chromium.org

Review URL: https://codereview.chromium.org/147713003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247169 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247169
ui/native_theme: Remove native_theme_win_unittest.cc file.

native_theme code does not have a unittests target, and
native_theme_win_unittest.cc is not compiled in any other unit test
target either. Which means that this file is unused and thus we should
remove it.

We should also remove it because it isn't testing anything relevant at
all.

BUG=318864
TEST=None
TBR=ben@chromium.org

Review URL: https://codereview.chromium.org/147813002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247170 0039d316-1c4b-4281-b951-d872f2087c98
Move kDataScheme constant into content namespace.

BUG=None
TEST=None, no functional changes
TBR=jam@chromium.org

Review URL: https://codereview.chromium.org/147823002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247171 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247171