Bug 1488701 - Remove misleading std::move's - r=froydnj

Doing std::move when returning/assigning a local or temporary object is
preventing the compiler from performing copy elision.

In the case of UniquePtr, it's easier to `return MakeUnique<T>(...)` instead of
the move verbose `UniquePtr<T> r(new T(...)); return r;`

Differential Revision: https://phabricator.services.mozilla.com/D5019

--HG--
extra : moz-landing-system : lando

gfx/gl/SharedSurfaceANGLE.cpp

@@ -86,10 +86,8 @@ SharedSurface_ANGLEShareHandle::Create(GLContext* gl, EGLConfig config,
     }
 #endif
 
-    typedef SharedSurface_ANGLEShareHandle ptrT;
-    UniquePtr<ptrT> ret( new ptrT(gl, egl, size, hasAlpha, pbuffer, shareHandle,
-                                  keyedMutex) );
-    return std::move(ret);
+    return MakeUnique<SharedSurface_ANGLEShareHandle>(
+               gl, egl, size, hasAlpha, pbuffer, shareHandle, keyedMutex);
 }
 
 EGLDisplay
@@ -347,9 +345,8 @@ SurfaceFactory_ANGLEShareHandle::Create(GLContext* gl, const SurfaceCaps& caps,
 
     EGLConfig config = GLContextEGL::Cast(gl)->mConfig;
 
-    typedef SurfaceFactory_ANGLEShareHandle ptrT;
-    UniquePtr<ptrT> ret( new ptrT(gl, caps, allocator, flags, egl, config) );
-    return std::move(ret);
+    return MakeUnique<SurfaceFactory_ANGLEShareHandle>(
+               gl, caps, allocator, flags, egl, config);
 }
 
 SurfaceFactory_ANGLEShareHandle::SurfaceFactory_ANGLEShareHandle(GLContext* gl,

gfx/gl/SharedSurfaceD3D11Interop.cpp

@@ -404,10 +404,9 @@ SharedSurface_D3D11Interop::Create(DXInterop2Device* interop,
 
     ////
 
-    typedef SharedSurface_D3D11Interop ptrT;
-    UniquePtr<ptrT> ret ( new ptrT(gl, size, hasAlpha, prodTex, interopFB, interopRB,
-                                   interop, lockHandle, texD3D, dxgiHandle) );
-    return std::move(ret);
+    return MakeUnique<SharedSurface_D3D11Interop>(
+               gl, size, hasAlpha, prodTex, interopFB, interopRB,
+               interop, lockHandle, texD3D, dxgiHandle);
 }
 
 SharedSurface_D3D11Interop::SharedSurface_D3D11Interop(GLContext* gl,
@@ -514,9 +513,8 @@ SurfaceFactory_D3D11Interop::Create(GLContext* gl, const SurfaceCaps& caps,
         return nullptr;
     }
 
-    typedef SurfaceFactory_D3D11Interop ptrT;
-    UniquePtr<ptrT> ret(new ptrT(gl, caps, allocator, flags, interop));
-    return std::move(ret);
+    return MakeUnique<SurfaceFactory_D3D11Interop>(
+               gl, caps, allocator, flags, interop);
 }
 
 SurfaceFactory_D3D11Interop::SurfaceFactory_D3D11Interop(GLContext* gl,

ipc/mscom/PassthruProxy.cpp

@@ -34,7 +34,7 @@ PassthruProxy::PassthruProxy(ProxyStream::Environment* aEnv, REFIID aIidToWrap,
 {
   ProxyStream proxyStream(aIidToWrap, aObjToWrap, aEnv,
                           ProxyStreamFlags::ePreservable);
-  mPreservedStream = std::move(proxyStream.GetPreservedStream());
+  mPreservedStream = proxyStream.GetPreservedStream();
   MOZ_ASSERT(mPreservedStream);
 }