Compile errors on Mac:

In file included from ../../third_party/angle/src/libANGLE/Framebuffer.cpp:10:
In file included from ../../third_party/angle/src/libANGLE/Framebuffer.h:13:
In file included from /Applications/Xcode5.1.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.6.sdk/usr/include/c++/4.2.1/vector:68:
/Applications/Xcode5.1.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.6.sdk/usr/include/c++/4.2.1/bits/stl_construct.h:81:38: error: call to implicitly-deleted copy constructor of 'gl::FramebufferAttachment'
      ::new(static_cast<void*>(__p)) _T1(__value);
                                     ^   ~~~~~~~
This reverts commit ed61a5f6.

Change-Id: I602bffc96f77cffa217cb63a5cc3caf334fd9879
Reviewed-on: https://chromium-review.googlesource.com/266652Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>