Update legacy Tuple-using code.

content/renderer/input/input_event_filter_unittest.cc

Index: content/renderer/input/input_event_filter_unittest.cc
diff --git a/content/renderer/input/input_event_filter_unittest.cc b/content/renderer/input/input_event_filter_unittest.cc
index df08796b0a2e245171e71a24e413bdfd35920143..79cb66c803a5fed9aaf6a3ba26152a0ec972e971 100644
--- a/content/renderer/input/input_event_filter_unittest.cc
+++ b/content/renderer/input/input_event_filter_unittest.cc
@@ -179,8 +179,8 @@ TEST_F(InputEventFilterTest, Basic) {
 
     InputHostMsg_HandleInputEvent_ACK::Param params;
     EXPECT_TRUE(InputHostMsg_HandleInputEvent_ACK::Read(message, &params));
-    WebInputEvent::Type event_type = params.a.type;
-    InputEventAckState ack_result = params.a.state;
+    WebInputEvent::Type event_type = get<0>(params).type;
+    InputEventAckState ack_result = get<0>(params).state;
 
     EXPECT_EQ(kEvents[i].type, event_type);
     EXPECT_EQ(ack_result, INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS);
@@ -205,7 +205,7 @@ TEST_F(InputEventFilterTest, Basic) {
     ASSERT_EQ(InputMsg_HandleInputEvent::ID, message.type());
     InputMsg_HandleInputEvent::Param params;
     EXPECT_TRUE(InputMsg_HandleInputEvent::Read(&message, &params));
-    const WebInputEvent* event = params.a;
+    const WebInputEvent* event = get<0>(params);
 
     EXPECT_EQ(kEvents[i].size, event->size);
     EXPECT_TRUE(memcmp(&kEvents[i], event, event->size) == 0);
@@ -231,8 +231,8 @@ TEST_F(InputEventFilterTest, Basic) {
 
     InputHostMsg_HandleInputEvent_ACK::Param params;
     EXPECT_TRUE(InputHostMsg_HandleInputEvent_ACK::Read(message, &params));
-    WebInputEvent::Type event_type = params.a.type;
-    InputEventAckState ack_result = params.a.state;
+    WebInputEvent::Type event_type = get<0>(params).type;
+    InputEventAckState ack_result = get<0>(params).state;
     EXPECT_EQ(kEvents[i].type, event_type);
     EXPECT_EQ(ack_result, INPUT_EVENT_ACK_STATE_CONSUMED);
   }