Move Tuple to base namespace.

Namespace change only, no functionality change.

The only non-search-and-replace change is in generate_gmock_mutant.py which changes some line wrapping logic for the generated gmock_mutant header.

NOPRESUBMIT=true
(No presubmit due to long lines in the generated gmock_mutant.h header).
R=sky

Review URL: https://codereview.chromium.org/1159553007

Cr-Commit-Position: refs/heads/master@{#332058}
diff --git a/content/renderer/render_widget_unittest.cc b/content/renderer/render_widget_unittest.cc
index 431b2fa5..d9b919a 100644
--- a/content/renderer/render_widget_unittest.cc
+++ b/content/renderer/render_widget_unittest.cc
@@ -89,7 +89,7 @@
   EXPECT_EQ(InputHostMsg_HandleInputEvent_ACK::ID, message->type());
   InputHostMsg_HandleInputEvent_ACK::Param params;
   InputHostMsg_HandleInputEvent_ACK::Read(message, &params);
-  InputEventAckState ack_state = get<0>(params).state;
+  InputEventAckState ack_state = base::get<0>(params).state;
   EXPECT_EQ(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS, ack_state);
   widget->sink()->ClearMessages();
 
@@ -103,7 +103,7 @@
   message = widget->sink()->GetMessageAt(0);
   EXPECT_EQ(InputHostMsg_HandleInputEvent_ACK::ID, message->type());
   InputHostMsg_HandleInputEvent_ACK::Read(message, &params);
-  ack_state = get<0>(params).state;
+  ack_state = base::get<0>(params).state;
   EXPECT_EQ(INPUT_EVENT_ACK_STATE_NOT_CONSUMED, ack_state);
   widget->sink()->ClearMessages();
 }
@@ -127,7 +127,7 @@
   EXPECT_EQ(InputHostMsg_HandleInputEvent_ACK::ID, message->type());
   InputHostMsg_HandleInputEvent_ACK::Param params;
   InputHostMsg_HandleInputEvent_ACK::Read(message, &params);
-  InputEventAckState ack_state = get<0>(params).state;
+  InputEventAckState ack_state = base::get<0>(params).state;
   EXPECT_EQ(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS, ack_state);
   widget->sink()->ClearMessages();
 
@@ -138,7 +138,7 @@
   message = widget->sink()->GetMessageAt(0);
   EXPECT_EQ(InputHostMsg_HandleInputEvent_ACK::ID, message->type());
   InputHostMsg_HandleInputEvent_ACK::Read(message, &params);
-  ack_state = get<0>(params).state;
+  ack_state = base::get<0>(params).state;
   EXPECT_EQ(INPUT_EVENT_ACK_STATE_NOT_CONSUMED, ack_state);
   widget->sink()->ClearMessages();
 }