UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Steps to reproduce the problem:
1. Get code and generate Visual Studio project files.
2. Open all.sln
3. Note errors in output window

What is the expected behavior?
Expected all projects to open with no errors.

What went wrong?
There are several errors reported in the Visual Studio output window like:

C:\chromium\src\out\Default\obj\cc\ipc\interfaces.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../cc/ipc:struct_traits". The given path's format is not supported.

Note the "cc/ipc:struct_traits" in the path.

Looking at interfaces.vcxproj I see four lines like the following within the project file's <ItemGroup> section:

<None Include="../../../../../cc/ipc:struct_traits" />

There is no "ipc:struct_traits" file at that location.  All of the other lines within <ItemGroup> refer to existing .h files.

I'm thinking the four "ipc:struct_traits" lines might be some anomaly in the code that generates the project file.

Here is the full text from the Visual Studio output window:

C:\chromium\src\out\Default\obj\cc\ipc\interfaces.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../cc/ipc:struct_traits". The given path's format is not supported.

C:\chromium\src\out\Default\obj\cc\ipc\interfaces_blink.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../cc/ipc:struct_traits". The given path's format is not supported.

C:\chromium\src\out\Default\obj\content\common\mojo_bindings.vcxproj : error  : The item "..\..\..\..\..\content\common\resource_messages.h" already exists under the filter "".

C:\chromium\src\out\Default\obj\media\mojo\interfaces\interfaces.vcxproj : error  : The item "..\..\..\..\..\..\media\base\ipc\media_param_traits_macros.h" already exists under the filter "".

C:\chromium\src\out\Default\obj\mojo\common\common_custom_types.vcxproj : error  : The item "..\..\..\..\..\mojo\common\common_custom_types_struct_traits.h" already exists under the filter "".

C:\chromium\src\out\Default\obj\skia\public\interfaces\interfaces.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../../skia/public/interfaces:struct_traits". The given path's format is not supported.

C:\chromium\src\out\Default\obj\ui\events\mojo\interfaces.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../../ui/events/mojo:struct_traits". The given path's format is not supported.

C:\chromium\src\out\Default\obj\ui\message_center\mojo\mojo.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../../ui/message_center/mojo:struct_traits". The given path's format is not supported.

C:\chromium\src\out\Default\obj\cc\ipc\interfaces.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../cc/ipc:struct_traits". The given path's format is not supported.

C:\chromium\src\out\Default\obj\cc\ipc\interfaces_blink.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../cc/ipc:struct_traits". The given path's format is not supported.

C:\chromium\src\out\Default\obj\content\common\mojo_bindings.vcxproj : error  : The item "..\..\..\..\..\content\common\resource_messages.h" already exists under the filter "".

C:\chromium\src\out\Default\obj\media\mojo\interfaces\interfaces.vcxproj : error  : The item "..\..\..\..\..\..\media\base\ipc\media_param_traits_macros.h" already exists under the filter "".

C:\chromium\src\out\Default\obj\mojo\common\common_custom_types.vcxproj : error  : The item "..\..\..\..\..\mojo\common\common_custom_types_struct_traits.h" already exists under the filter "".

C:\chromium\src\out\Default\obj\skia\public\interfaces\interfaces.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../../skia/public/interfaces:struct_traits". The given path's format is not supported.

C:\chromium\src\out\Default\obj\ui\events\mojo\interfaces.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../../ui/events/mojo:struct_traits". The given path's format is not supported.

C:\chromium\src\out\Default\obj\ui\message_center\mojo\mojo.vcxproj : error  : The item metadata "%(FullPath)" cannot be applied to the path "../../../../../../ui/message_center/mojo:struct_traits". The given path's format is not supported.

Did this work before? N/A 

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