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diff -up firefox-53.0/dom/media/webrtc/MediaEngine.h.1335250 firefox-53.0/dom/media/webrtc/MediaEngine.h
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--- firefox-53.0/dom/media/webrtc/MediaEngine.h.1335250	2017-04-11 06:15:22.000000000 +0200
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+++ firefox-53.0/dom/media/webrtc/MediaEngine.h	2017-04-19 20:35:55.264741939 +0200
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@@ -226,7 +226,7 @@ public:
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     ~AllocationHandle() {}
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   public:
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     AllocationHandle(const dom::MediaTrackConstraints& aConstraints,
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-                     const ipc::PrincipalInfo& aPrincipalInfo,
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+                     const mozilla::ipc::PrincipalInfo& aPrincipalInfo,
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                      const MediaEnginePrefs& aPrefs,
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                      const nsString& aDeviceId)
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@@ -236,7 +236,7 @@ public:
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       mDeviceId(aDeviceId) {}
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   public:
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     NormalizedConstraints mConstraints;
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-    ipc::PrincipalInfo mPrincipalInfo;
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+    mozilla::ipc::PrincipalInfo mPrincipalInfo;
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     MediaEnginePrefs mPrefs;
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     nsString mDeviceId;
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   };
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@@ -327,7 +327,7 @@ public:
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   virtual nsresult Allocate(const dom::MediaTrackConstraints &aConstraints,
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                             const MediaEnginePrefs &aPrefs,
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                             const nsString& aDeviceId,
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-                            const ipc::PrincipalInfo& aPrincipalInfo,
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+                            const mozilla::ipc::PrincipalInfo& aPrincipalInfo,
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                             AllocationHandle** aOutHandle,
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                             const char** aOutBadConstraint)
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   {