Renamed RTCStatsReport to RTCLegacyStatsReport in objc files.

This is to avoid a naming conflict with webrtc::RTCStatsReport that is
surfaced if you try to include it in peerconnectioninterface.h.

Background: The current stats is very much non-spec-compliant. A new
stats collection API is underway that is meant to be spec-compliant.
Some classes in Chromium and webrtc/sdk/objc have spec-compliant names
but non-spec-compliant behavior. These are being renamed to "Legacy" so
that new spec-compliant classes can be added with the correct names.

BUG=chromium:627816
TBR=tkchin@webrtc.org
NOTRY=True

Review-Url: https://codereview.webrtc.org/2313943002
Cr-Commit-Position: refs/heads/master@{#14150}
diff --git a/webrtc/sdk/sdk.gyp b/webrtc/sdk/sdk.gyp
index d6eaa1e..908d544 100644
--- a/webrtc/sdk/sdk.gyp
+++ b/webrtc/sdk/sdk.gyp
@@ -123,6 +123,8 @@
             'objc/Framework/Classes/RTCIceCandidate.mm',
             'objc/Framework/Classes/RTCIceServer+Private.h',
             'objc/Framework/Classes/RTCIceServer.mm',
+            'objc/Framework/Classes/RTCLegacyStatsReport+Private.h',
+            'objc/Framework/Classes/RTCLegacyStatsReport.mm',
             'objc/Framework/Classes/RTCMediaConstraints+Private.h',
             'objc/Framework/Classes/RTCMediaConstraints.mm',
             'objc/Framework/Classes/RTCMediaSource+Private.h',
@@ -155,8 +157,6 @@
             'objc/Framework/Classes/RTCShader+Private.h',
             'objc/Framework/Classes/RTCShader.h',
             'objc/Framework/Classes/RTCShader.mm',
-            'objc/Framework/Classes/RTCStatsReport+Private.h',
-            'objc/Framework/Classes/RTCStatsReport.mm',
             'objc/Framework/Classes/RTCVideoFrame+Private.h',
             'objc/Framework/Classes/RTCVideoFrame.mm',
             'objc/Framework/Classes/RTCVideoRendererAdapter+Private.h',
@@ -176,6 +176,7 @@
             'objc/Framework/Headers/WebRTC/RTCDataChannelConfiguration.h',
             'objc/Framework/Headers/WebRTC/RTCIceCandidate.h',
             'objc/Framework/Headers/WebRTC/RTCIceServer.h',
+            'objc/Framework/Headers/WebRTC/RTCLegacyStatsReport.h',
             'objc/Framework/Headers/WebRTC/RTCMediaConstraints.h',
             'objc/Framework/Headers/WebRTC/RTCMediaSource.h',
             'objc/Framework/Headers/WebRTC/RTCMediaStream.h',
@@ -188,7 +189,6 @@
             'objc/Framework/Headers/WebRTC/RTCRtpReceiver.h',
             'objc/Framework/Headers/WebRTC/RTCRtpSender.h',
             'objc/Framework/Headers/WebRTC/RTCSessionDescription.h',
-            'objc/Framework/Headers/WebRTC/RTCStatsReport.h',
             'objc/Framework/Headers/WebRTC/RTCVideoFrame.h',
             'objc/Framework/Headers/WebRTC/RTCVideoRenderer.h',
             'objc/Framework/Headers/WebRTC/RTCVideoSource.h',
@@ -268,6 +268,7 @@
             'objc/Framework/Headers/WebRTC/RTCFileLogger.h',
             'objc/Framework/Headers/WebRTC/RTCIceCandidate.h',
             'objc/Framework/Headers/WebRTC/RTCIceServer.h',
+            'objc/Framework/Headers/WebRTC/RTCLegacyStatsReport.h',
             'objc/Framework/Headers/WebRTC/RTCLogging.h',
             'objc/Framework/Headers/WebRTC/RTCMacros.h',
             'objc/Framework/Headers/WebRTC/RTCMediaConstraints.h',
@@ -286,7 +287,6 @@
             'objc/Framework/Headers/WebRTC/RTCRtpSender.h',
             'objc/Framework/Headers/WebRTC/RTCSessionDescription.h',
             'objc/Framework/Headers/WebRTC/RTCSSLAdapter.h',
-            'objc/Framework/Headers/WebRTC/RTCStatsReport.h',
             'objc/Framework/Headers/WebRTC/RTCTracing.h',
             'objc/Framework/Headers/WebRTC/RTCVideoFrame.h',
             'objc/Framework/Headers/WebRTC/RTCVideoRenderer.h',