Revert "Upgrade compiler to Clang 10. (#11256)" (#13017)

This reverts commit 9ce33571.

DEPS

@@ -136,7 +136,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + '73331c60597020b7ba4743cbefef24561e32eca7',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + 'edd0f2d19604a7d63deb20e9c19c1412acb8a9bd',
 
    # Fuchsia compatibility
    #
@@ -524,7 +524,7 @@ deps = {
     'packages': [
       {
         'package': 'fuchsia/clang/${{platform}}',
-        'version': 'git_revision:cea8882254f97ae82867e25e736959d1cfa31896'
+        'version': 'git_revision:de39621f0f03f20633bdfa50bde97a3908bf6e98'
       }
     ],
     'condition': 'host_os == "mac" or host_os == "linux"',

shell/common/input_events_unittests.cc

@@ -183,7 +183,7 @@ TEST_F(ShellTest, DelayAtMostOneEventForFasterThanVSyncInputEvents) {
 TEST_F(ShellTest, HandlesActualIphoneXsInputEvents) {
   // Actual delivery times measured on iPhone Xs, in the unit of frame_time
   // (16.67ms for 60Hz).
-  double iphone_xs_times[] = {0.15,
+  constexpr double iphone_xs_times[] = {0.15,
                                         1.0773046874999999,
                                         2.1738720703124996,
                                         3.0579052734374996,
@@ -239,8 +239,8 @@ TEST_F(ShellTest, HandlesActualIphoneXsInputEvents) {
     // TestSimulatedInputEvents.
     UnitlessTime base_latency =
         static_cast<UnitlessTime>(base_latency_f * frame_time);
-    Generator iphone_xs_generator = [frame_time, base_latency,
-                                     &iphone_xs_times](int i) {
+    Generator iphone_xs_generator = [frame_time, iphone_xs_times,
+                                     base_latency](int i) {
       return base_latency +
              static_cast<UnitlessTime>(iphone_xs_times[i] * frame_time);
     };