[Blimp client] Move client code into blimp::client namespace

blimp/client/session/tab_control_feature_unittest.cc

Index: blimp/client/session/tab_control_feature_unittest.cc
diff --git a/blimp/client/session/tab_control_feature_unittest.cc b/blimp/client/session/tab_control_feature_unittest.cc
index c93b2c6be766ceed9bb6e2c8088d7bfecf0bcf65..e70be8801e3ccd0fb08b838a9c9a94331c866763 100644
--- a/blimp/client/session/tab_control_feature_unittest.cc
+++ b/blimp/client/session/tab_control_feature_unittest.cc
@@ -17,6 +17,7 @@
 using testing::_;
 
 namespace blimp {
+namespace client {
 
 MATCHER_P3(EqualsSizeMessage, width, height, dp_to_px, "") {
   return arg.tab_control().type() == TabControlMessage::SIZE &&
@@ -86,4 +87,5 @@ TEST_F(TabControlFeatureTest, NoDuplicateSizeMessage) {
   feature_.SetSizeAndScale(gfx::Size(width + 1, height + 1), dp_to_px + 1);
 }
 
+}  // namespace client
 }  // namespace blimp