Revert of Enable generation of local host candidate when RTCConfiguration is null.

Revert of Enable generation of local host candidate when RTCConfiguration is null. (patchset #6 id:100001 of https://codereview.chromium.org/1321543002/ )

Reason for revert:
Looks like this might've broken browser_tests on 32-bit linux: http://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29%2832%29/builds/19677

WebRtcBrowserTest.RunsAudioVideoWebRTCCallInTwoTabs (run #1):

ASSERTION FAILED: !m_storage
../../third_party/WebKit/public/platform/WebPrivatePtr.h(243) : ~WebPrivatePtr
1   0xf5b3b647 blink::failedAssertion(char const*, int, char const*, char const*)
2   0xf2d690c1
3   0xf2d68dcb
4   0xf2d4dbed
5   0xf2d4d66c content::RTCPeerConnectionHandler::initialize(blink::WebRTCConfiguration const&, blink::WebMediaConstraints const&)
6   0xe2ce3d09
7   0xe2ce3846
8   0xe32e2ed9
9   0xe32e21fb
10  0xf005197a
11  0xf0099a00
12  0x5270c15c
13  0x5272d9b6
14  0x52740518
15  0x527402c4
16  0x52740190
17  0x5272da9e
18  0x5272a59f
19  0xf02f1760
20  0xf02f0b64
21  0xeffefe92 v8::Script::Run(v8::Local<v8::Context>)
22  0xe3d0a79c blink::V8ScriptRunner::runCompiledScript(v8::Isolate*, v8::Local<v8::Script>, blink::ExecutionContext*)
23  0xe3c4f4a6 blink::ScriptController::executeScriptAndReturnValue(v8::Local<v8::Context>, blink::ScriptSourceCode const&, blink::AccessControlStatus, double*)
24  0xe3c5214d blink::ScriptController::evaluateScriptInMainWorld(blink::ScriptSourceCode const&, blink::AccessControlStatus, blink::ScriptController::ExecuteScriptPolicy, double*)
25  0xe3c524e9 blink::ScriptController::executeScriptInMainWorldAndReturnValue(blink::ScriptSourceCode const&)
26  0xec860f96
27  0xf29f2b67 content::RenderFrameImpl::OnJavaScriptExecuteRequestForTests(std::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> > const&, int, bool, bool)
28  0xf2a2b98b
29  0xf2a2b829
30  0xf2a181be
31  0xf29ef105 content::RenderFrameImpl::OnMessageReceived(IPC::Message const&)
Received signal 11 SEGV_MAPERR 0000fbadbeef
#0 0x0000eb12f924 base::debug::StackTrace::StackTrace()
#1 0x0000eb12f44b base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x0000f76e5420 ([vdso]+0x41f)
#3 0x0000f5b3b64c blink::failedAssertion()
#4 0x0000f2d690c1 blink::WebPrivatePtr<>::~WebPrivatePtr()
#5 0x0000f2d68dcb blink::WebRTCICEServerArray::~WebRTCICEServerArray()
#6 0x0000f2d4dbed content::(anonymous namespace)::GetNativeRtcConfiguration()
#7 0x0000f2d4d66c content::RTCPeerConnectionHandler::initialize()
#8 0x0000e2ce3d09 blink::RTCPeerConnection::RTCPeerConnection()
#9 0x0000e2ce3846 blink::RTCPeerConnection::create()
#10 0x0000e32e2ed9 blink::RTCPeerConnectionV8Internal::constructor()
#11 0x0000e32e21fb blink::V8RTCPeerConnection::constructorCallback()
#12 0x0000f005197a v8::internal::FunctionCallbackArguments::Call()
#13 0x0000f0099a00 v8::internal::Builtin_HandleApiCallConstruct()
#14 0x00005270c15c <unknown>
#15 0x00005272d9b6 <unknown>
#16 0x000052740518 <unknown>
#17 0x0000527402c4 <unknown>
#18 0x000052740190 <unknown>
#19 0x00005272da9e <unknown>
#20 0x00005272a59f <unknown>
#21 0x0000f02f1760 v8::internal::Invoke()
#22 0x0000f02f0b64 v8::internal::Execution::Call()
#23 0x0000effefe92 v8::Script::Run()
#24 0x0000e3d0a79c blink::V8ScriptRunner::runCompiledScript()
#25 0x0000e3c4f4a6 blink::ScriptController::executeScriptAndReturnValue()
#26 0x0000e3c5214d blink::ScriptController::evaluateScriptInMainWorld()
#27 0x0000e3c524e9 blink::ScriptController::executeScriptInMainWorldAndReturnValue()
#28 0x0000ec860f96 blink::WebLocalFrameImpl::executeScriptAndReturnValue()
#29 0x0000f29f2b67 content::RenderFrameImpl::OnJavaScriptExecuteRequestForTests()
#30 0x0000f2a2b98b _ZN4base20DispatchToMethodImplIN7content15RenderFrameImplEMS2_FvRKSbItNS_20string16_char_traitsESaItEEibbEJS5_ibbEJLj0ELj1ELj2ELj3EEEEvPT_T0_RKNS_5TupleIJDpT1_EEENS_13IndexSequenceIJXspT2_EEEE
#31 0x0000f2a2b829 _ZN4base16DispatchToMethodIN7content15RenderFrameImplEMS2_FvRKSbItNS_20string16_char_traitsESaItEEibbEJS5_ibbEEEvPT_T0_RKNS_5TupleIJDpT1_EEE
#32 0x0000f2a181be FrameMsg_JavaScriptExecuteRequestForTests::Dispatch<>()
#33 0x0000f29ef105 content::RenderFrameImpl::OnMessageReceived()
#34 0x0000f279d277 content::MessageRouter::RouteMessage()
#35 0x0000f279d1d8 content::MessageRouter::OnMessageReceived()
#36 0x0000f21dd5bc content::ChildThreadImpl::OnMessageReceived()
#37 0x0000e8da2c32 IPC::ChannelProxy::Context::OnDispatchMessage()
#38 0x0000e8da9073 base::internal::RunnableAdapter<>::Run()

Original issue's description:
> Enable generation of local host candidate when RTCConfiguration is null.
>
> For demo page which doesn't use mic/camera to retain connectivity without stun/turn, it needs localhost candidate. Localhost candidate will only be generated if RTCConfiguration is not specified in the JS RTCPeerConnection ctor.
>
> Note that enable_localhost_candidate is only honored when the adapter enumeration is disabled inside webrtc.
>
> hangouts use iceServers:[] which will not cause local host generated when multiple_routes disabled.
>
> This change depens on ongoing CL https://codereview.chromium.org/1315413004/
>
> BUG=webrtc:4517
>
> Committed: https://crrev.com/e4916a9c873c13e33af1d630dc29fd0205deae27
> Cr-Commit-Position: refs/heads/master@{#349315}

TBR=pthatcher@chromium.org,juberti@chromium.org,juberti@webrtc.org,juberti@google.com,tommi@chromium.org,guoweis@google.com,guoweis@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:4517
Committed: https://crrev.com/c2bf83cea0e5b4063ca38ccdcffcc2258272df14
Cr-Commit-Position: refs/heads/master@{#349353}

[Nico, 2015-09-17 04:03:35]

Created Revert of Enable generation of local host candidate when
RTCConfiguration is null.

[commit-bot: I haz the power, 2015-09-17 04:03:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1352753002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1352753002/1

[commit-bot: I haz the power, 2015-09-17 04:04:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-17 04:04:35]

Patchset 1 (id:??) landed as
https://crrev.com/c2bf83cea0e5b4063ca38ccdcffcc2258272df14
Cr-Commit-Position: refs/heads/master@{#349353}