Remove std::string histogram name from HistogramBase object.

base/metrics/histogram_base_unittest.cc

Index: base/metrics/histogram_base_unittest.cc
diff --git a/base/metrics/histogram_base_unittest.cc b/base/metrics/histogram_base_unittest.cc
index 1eb8fd46084ba2c82d396db9f810042b90376f5d..bb46bc49292c1d51cfebac8b9db40ff55a18c427 100644
--- a/base/metrics/histogram_base_unittest.cc
+++ b/base/metrics/histogram_base_unittest.cc
@@ -62,7 +62,7 @@ TEST_F(HistogramBaseTest, DeserializeHistogram) {
   deserialized = DeserializeHistogramInfo(&iter2);
   EXPECT_TRUE(deserialized);
   EXPECT_NE(histogram, deserialized);
-  EXPECT_EQ("TestHistogram", deserialized->histogram_name());
+  EXPECT_EQ("TestHistogram", StringPiece(deserialized->histogram_name()));
   EXPECT_TRUE(deserialized->HasConstructionArguments(1, 1000, 10));
 
   // kIPCSerializationSourceFlag will be cleared.
@@ -87,7 +87,7 @@ TEST_F(HistogramBaseTest, DeserializeLinearHistogram) {
   deserialized = DeserializeHistogramInfo(&iter2);
   EXPECT_TRUE(deserialized);
   EXPECT_NE(histogram, deserialized);
-  EXPECT_EQ("TestHistogram", deserialized->histogram_name());
+  EXPECT_EQ("TestHistogram", StringPiece(deserialized->histogram_name()));
   EXPECT_TRUE(deserialized->HasConstructionArguments(1, 1000, 10));
   EXPECT_EQ(0, deserialized->flags());
 }
@@ -109,7 +109,7 @@ TEST_F(HistogramBaseTest, DeserializeBooleanHistogram) {
   deserialized = DeserializeHistogramInfo(&iter2);
   EXPECT_TRUE(deserialized);
   EXPECT_NE(histogram, deserialized);
-  EXPECT_EQ("TestHistogram", deserialized->histogram_name());
+  EXPECT_EQ("TestHistogram", StringPiece(deserialized->histogram_name()));
   EXPECT_TRUE(deserialized->HasConstructionArguments(1, 2, 3));
   EXPECT_EQ(0, deserialized->flags());
 }
@@ -136,7 +136,7 @@ TEST_F(HistogramBaseTest, DeserializeCustomHistogram) {
   deserialized = DeserializeHistogramInfo(&iter2);
   EXPECT_TRUE(deserialized);
   EXPECT_NE(histogram, deserialized);
-  EXPECT_EQ("TestHistogram", deserialized->histogram_name());
+  EXPECT_EQ("TestHistogram", StringPiece(deserialized->histogram_name()));
   EXPECT_TRUE(deserialized->HasConstructionArguments(5, 13, 4));
   EXPECT_EQ(0, deserialized->flags());
 }
@@ -158,7 +158,7 @@ TEST_F(HistogramBaseTest, DeserializeSparseHistogram) {
   deserialized = DeserializeHistogramInfo(&iter2);
   EXPECT_TRUE(deserialized);
   EXPECT_NE(histogram, deserialized);
-  EXPECT_EQ("TestHistogram", deserialized->histogram_name());
+  EXPECT_EQ("TestHistogram", StringPiece(deserialized->histogram_name()));
   EXPECT_EQ(0, deserialized->flags());
 }