Move RemoveChars, ReplaceChars, TrimString, and TruncateUTF8ToByteSize to base namespace.

content/common/page_state_serialization_unittest.cc

Index: content/common/page_state_serialization_unittest.cc
diff --git a/content/common/page_state_serialization_unittest.cc b/content/common/page_state_serialization_unittest.cc
index 288644ae5ffdbb432b5482183bf97caba9591ef5..c0c98d3313bde64028552254b71b3b147fc624e9 100644
--- a/content/common/page_state_serialization_unittest.cc
+++ b/content/common/page_state_serialization_unittest.cc
@@ -208,7 +208,7 @@ class PageStateSerializationTest : public testing::Test {
     }
 
     std::string trimmed_contents;
-    EXPECT_TRUE(RemoveChars(file_contents, "\r\n", &trimmed_contents));
+    EXPECT_TRUE(base::RemoveChars(file_contents, "\r\n", &trimmed_contents));
 
     std::string encoded;
     EXPECT_TRUE(base::Base64Decode(trimmed_contents, &encoded));