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Currently, the .cc is included in multiple targets. In incremental builds this results in errors like:

[609->8104/8713 ~0] LINK_EMBED unit_tests.exe
FAILED: d:\src\depot_tools\python276_bin\python.exe gyp-win-tool link-with-manifests environment.x86 True unit_tests.exe "d:\src\depot_tools\python276_bin\python.exe gyp-win-tool link-wrapper environment.x86 False link.exe /nologo /OUT:unit_tests.exe @unit_tests.exe.rsp" 1 mt.exe rc.exe "obj\chrome\unit_tests.unit_tests.exe.intermediate.manifest" obj\chrome\unit_tests.unit_tests.exe.generated.manifest ..\..\build\win\compatibility.manifest
content_app_both.startup_helper_win.obj : error LNK2005: "void __cdecl content::InitializeSandboxInfo(struct sandbox::SandboxInterfaceInfo *)" (?InitializeSandboxInfo@content@@YAXPAUSandboxInterfaceInfo@sandbox@@@Z) already defined in test_support_content.startup_helper_win.obj
content_app_both.startup_helper_win.obj : error LNK2005: "void __cdecl `anonymous namespace'::InvalidParameter(wchar_t const *,wchar_t const *,wchar_t const *,unsigned int,unsigned int)" (?InvalidParameter@?A0xc496daa2@@YAXPB_W00II@Z) already defined in test_support_content.startup_helper_win.obj
content_app_both.startup_helper_win.obj : error LNK2005: "void __cdecl `anonymous namespace'::PureCall(void)" (?PureCall@?A0xc496daa2@@YAXXZ) already defined in test_support_content.startup_helper_win.obj
content_app_both.startup_helper_win.obj : error LNK2005: "void __cdecl content::RegisterInvalidParamHandler(void)" (?RegisterInvalidParamHandler@content@@YAXXZ) already defined in test_support_content.startup_helper_win.obj
content_app_both.startup_helper_win.obj : error LNK2005: "void __cdecl content::SetupCRT(class base::CommandLine const &)" (?SetupCRT@content@@YAXABVCommandLine@base@@@Z) already defined in test_support_content.startup_helper_win.obj
unit_tests.exe : fatal error LNK1169: one or more multiply defined symbols found

when incremental_chrome_dll=1 used in Release build.

By putting the .cc in a static_library target and depending on it as necessary, rather than including the .cc into multiple places, this is avoided.

R=jam@chromium.org
TBR=sky@chromium.org
BUG=404809

Review URL: https://codereview.chromium.org/470523005

Cr-Commit-Position: refs/heads/master@{#291256}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291256 0039d316-1c4b-4281-b951-d872f2087c98