Adding double braces for array initialization.

TBR=maxmorin@webrtc.org

Bug: webrtc:9076
Change-Id: Ic341ef7437392dd5d6141147a2412ec54204ae10
Reviewed-on: https://webrtc-review.googlesource.com/75121
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Max Morin <maxmorin@webrtc.org>
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23164}
diff --git a/modules/audio_processing/agc2/biquad_filter_unittest.cc b/modules/audio_processing/agc2/biquad_filter_unittest.cc
index 75c3b59..2fa161e 100644
--- a/modules/audio_processing/agc2/biquad_filter_unittest.cc
+++ b/modules/audio_processing/agc2/biquad_filter_unittest.cc
@@ -28,14 +28,14 @@
     std::array<std::array<float, kFrameSize>, kNumFrames>;
 
 constexpr FloatArraySequence kBiQuadInputSeq = {
-    {{-87.166290f, -8.029022f, 101.619583f, -0.294296f, -5.825764f, -8.890625f,
-      10.310432f, 54.845333f},
-     {-64.647644f, -6.883945f, 11.059189f, -95.242538f, -108.870834f,
-      11.024944f, 63.044102f, -52.709583f},
-     {-32.350529f, -18.108028f, -74.022339f, -8.986874f, -1.525581f,
-      103.705513f, 6.346226f, -14.319557f},
-     {22.645832f, -64.597153f, 55.462521f, -109.393188f, 10.117825f,
-      -40.019642f, -98.612228f, -8.330326f}}};
+    {{{-87.166290f, -8.029022f, 101.619583f, -0.294296f, -5.825764f, -8.890625f,
+       10.310432f, 54.845333f}},
+     {{-64.647644f, -6.883945f, 11.059189f, -95.242538f, -108.870834f,
+       11.024944f, 63.044102f, -52.709583f}},
+     {{-32.350529f, -18.108028f, -74.022339f, -8.986874f, -1.525581f,
+       103.705513f, 6.346226f, -14.319557f}},
+     {{22.645832f, -64.597153f, 55.462521f, -109.393188f, 10.117825f,
+       -40.019642f, -98.612228f, -8.330326f}}}};
 
 // Generated via "B, A = scipy.signal.butter(2, 30/12000, btype='highpass')"
 const BiQuadFilter::BiQuadCoefficients kBiQuadConfig = {
@@ -48,14 +48,14 @@
 //   yn, zi = scipy.signal.lfilter(B, A, x[i], zi=zi)
 //   print(yn)
 constexpr FloatArraySequence kBiQuadOutputSeq = {
-    {{-86.68354497f, -7.02175351f, 102.10290352f, -0.37487333f, -5.87205847f,
-      -8.85521608f, 10.33772563f, 54.51157181f},
-     {-64.92531604f, -6.76395978f, 11.15534507f, -94.68073341f, -107.18177856f,
-      13.24642474f, 64.84288941f, -50.97822629f},
-     {-30.1579652f, -15.64850899f, -71.06662821f, -5.5883229f, 1.91175353f,
-      106.5572003f, 8.57183046f, -12.06298473f},
-     {24.84286614f, -62.18094158f, 57.91488056f, -106.65685933f, 13.38760103f,
-      -36.60367134f, -94.44880104f, -3.59920354f}}};
+    {{{-86.68354497f, -7.02175351f, 102.10290352f, -0.37487333f, -5.87205847f,
+       -8.85521608f, 10.33772563f, 54.51157181f}},
+     {{-64.92531604f, -6.76395978f, 11.15534507f, -94.68073341f, -107.18177856f,
+       13.24642474f, 64.84288941f, -50.97822629f}},
+     {{-30.1579652f, -15.64850899f, -71.06662821f, -5.5883229f, 1.91175353f,
+       106.5572003f, 8.57183046f, -12.06298473f}},
+     {{24.84286614f, -62.18094158f, 57.91488056f, -106.65685933f, 13.38760103f,
+       -36.60367134f, -94.44880104f, -3.59920354f}}}};
 
 // Fail for every pair from two equally sized rtc::ArrayView<float> views such
 // that their relative error is above a given threshold. If the expected value