Revert of Replace the HomeCard by the AppList in Athena.

Revert of Replace the HomeCard by the AppList in Athena. (https://codereview.chromium.org/306083005/)

Reason for revert:
Seems to break compilation on Linux Chromium OS ASan LSan Builder:
FAILED: /mnt/data/b/build/goma/gomacc ../../third_party/llvm-build/Release+Asserts/bin/clang++ -Wl,-z,now -Wl,-z,relro -Wl,--fatal-warnings -pthread -Wl,-z,noexecstack -fPIC -B/mnt/data/b/build/slave/Linux_Chromium_OS_ASan_LSan_Builder/build/src/third_party/binutils/Linux_x64/Release/bin -Wl,--disable-new-dtags -L. -Wl,-u_sanitizer_options_link_helper -m64 -fsanitize=address -fsanitize=leak -Wl,--icf=none -Wl,-O1 -Wl,--gc-sections -o athena_shell -Wl,--start-group [..]
../../content/browser/renderer_host/pepper/browser_ppapi_host_impl.cc:61:error: undefined reference to 'ppapi::host::PpapiHost::PpapiHost(IPC::Sender*, ppapi::PpapiPermissions const&)'
../../content/browser/renderer_host/pepper/browser_ppapi_host_impl.cc:63:error: undefined reference to 'ppapi::host::PpapiHost::AddHostFactoryFilter(scoped_ptr<ppapi::host::HostFactory, base::DefaultDeleter<ppapi::host::HostFactory> >)'
../../content/browser/renderer_host/pepper/content_browser_pepper_host_factory.cc:123:error: undefined reference to 'ppapi::host::MessageFilterHost::MessageFilterHost(ppapi::host::PpapiHost*, int, int, scoped_refptr<ppapi::host::ResourceMessageFilter> const&)'
../../content/browser/renderer_host/pepper/content_browser_pepper_host_factory.cc:93:error: undefined reference to 'ppapi::host::MessageFilterHost::MessageFilterHost(ppapi::host::PpapiHost*, int, int, scoped_refptr<ppapi::host::ResourceMessageFilter> const&)'
[etc...]

Original issue's description:
> Replace the HomeCard by the AppList in Athena.
> 
> BUG=370204
> R=oshima@chromium.org, benwells@chromium.org
> TBR=reed@google.com
> TEST=manually
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=274942

TBR=oshima@chromium.org,benwells@chromium.org,xiyuan@chromium.org,reed@google.com,mukai@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=370204
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=274953

[Marijn Kruisselbrink, 2014-06-04 23:36:55]

Created Revert of Replace the HomeCard by the AppList in Athena.

[Marijn Kruisselbrink, 2014-06-04 23:38:07]

The CQ bit was unchecked by mek@chromium.org

[Marijn Kruisselbrink, 2014-06-04 23:38:36]

The CQ bit was checked by mek@chromium.org

[commit-bot: I haz the power, 2014-06-04 23:40:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mek@chromium.org/319603004/1

[commit-bot: I haz the power, 2014-06-04 23:43:07]

Change committed as 274953