Something

ninja: WARNING: multiple rules generate ssl. build will not be correct; continuing anyway
[1/17] CXX obj/views/controls/button/views.button_dropdown.o
FAILED: g++ -B/usr/local/gold/bin -MMD -MF obj/views/controls/button/views.button_dropdown.o.d -DNO_HEAPCHECKER -DDISABLE_NACL -DCHROMIUM_BUILD -DCOMPONENT_BUILD -DTOOLKIT_VIEWS=1 -DUSE_ONLY_PURE_VIEWS=1 -DVIEWS_COMPOSITOR=1 -DUSE_AURA=1 -DFILE_MANAGER_EXTENSION=1 -DWEBUI_TASK_MANAGER=1 -DENABLE_REMOTING=1 -DENABLE_P2P_APIS=1 -DENABLE_CONFIGURATION_POLICY -DENABLE_GPU=1 -DENABLE_EGLIMAGE=1 -DUSE_SKIA=1 -DENABLE_REGISTER_PROTOCOL_HANDLER=1 -DVIEWS_IMPLEMENTATION -DGL_GLEXT_PROTOTYPES -DGURL_DLL -DSK_BUILD_NO_IMAGE_ENCODE -D'GR_GL_CUSTOM_SETUP_HEADER="GrGLConfig_chrome.h"' -DGR_AGGRESSIVE_SHADER_OPTS=1 -DGR_DLL -DSKIA_DLL -DU_USING_ICU_NAMESPACE=0 -D__STDC_FORMAT_MACROS -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1 -D_DEBUG -I../../third_party/icu/public/common -I../../third_party/icu/public/i18n -I../../third_party/wtl/include -I../.. -I../../skia/config -I../../third_party/skia/include/config -I../../third_party/skia/include/core -I../../third_party/skia/include/effects -I../../third_party/skia/include/pdf -I../../third_party/skia/include/gpu -I../../third_party/skia/include/ports -I../../third_party/skia/gpu/include -I../../skia/ext -Igen/ui/app_locale_settings -Igen/ui/ui_strings -Igen/ui/ui_resources -Igen/ui/ui_resources_standard -Werror -pthread -fno-exceptions -Wall -Wno-unused-parameter -Wno-missing-field-initializers -D_FILE_OFFSET_BITS=64 -fvisibility=hidden -pipe -fPIC -fno-strict-aliasing -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -O0 -g -fno-rtti -fno-threadsafe-statics -fvisibility-inlines-hidden -Wsign-compare -c ../../views/controls/button/button_dropdown.cc -o obj/views/controls/button/views.button_dropdown.o
In file included from ../../base/bind_internal.h:15:0,
                 from ../../base/bind.h:14,
                 from ../../views/controls/button/button_dropdown.cc:7:
../../base/bind_helpers.h: In instantiation of ‘base::internal::SupportsAddRefAndRelease<aura::Window>::Base’:
../../base/bind_helpers.h:174:65:   instantiated from ‘const bool base::internal::SupportsAddRefAndRelease<aura::Window>::value’
../../base/bind_helpers.h:186:67:   instantiated from ‘base::internal::UnsafeBindtoRefCountedArgHelper<true, aura::Window>’
../../base/bind_helpers.h:195:62:   instantiated from ‘base::internal::UnsafeBindtoRefCountedArg<aura::Window*>’
../../base/bind_internal.h:1828:3:   instantiated from ‘base::internal::InvokerStorage2<void (views::ButtonDropDown::*)(aura::Window*), base::WeakPtr<views::ButtonDropDown>, aura::Window*>’
../../base/bind.h:56:21:   instantiated from ‘base::internal::InvokerStorageHolder<base::internal::InvokerStorage2<Sig, P1, P2> > base::Bind(Sig, const P1&, const P2&) [with Sig = void (views::ButtonDropDown::*)(aura::Window*), P1 = base::WeakPtr<views::ButtonDropDown>, P2 = aura::Window*]’
../../views/controls/button/button_dropdown.cc:64:48:   instantiated from here
../../base/bind_helpers.h:159:44: error: invalid use of incomplete type ‘struct aura::Window’
../../ui/gfx/native_widget_types.h:42:7: error: forward declaration of ‘struct aura::Window’
ninja: build stopped: cannot make progress due to previous errors.