Move StringToUpperASCII to base namespace

Removes some unnecessary base:: qualifications in the base files I touched. clang-formatted file_util_unittest because lots of wrapping changed with this removal (seems to be a big improvement).

BUG=

Review URL: https://codereview.chromium.org/1171973003

Cr-Commit-Position: refs/heads/master@{#333560}
diff --git a/net/http/http_util_unittest.cc b/net/http/http_util_unittest.cc
index 71602844..980c388 100644
--- a/net/http/http_util_unittest.cc
+++ b/net/http/http_util_unittest.cc
@@ -50,8 +50,9 @@
   for (size_t i = 0; i < arraysize(unsafe_headers); ++i) {
     EXPECT_FALSE(HttpUtil::IsSafeHeader(unsafe_headers[i]))
       << unsafe_headers[i];
-    EXPECT_FALSE(HttpUtil::IsSafeHeader(StringToUpperASCII(std::string(
-        unsafe_headers[i])))) << unsafe_headers[i];
+    EXPECT_FALSE(HttpUtil::IsSafeHeader(
+        base::StringToUpperASCII(std::string(unsafe_headers[i]))))
+        << unsafe_headers[i];
   }
   static const char* const safe_headers[] = {
     "foo",
@@ -95,8 +96,9 @@
   };
   for (size_t i = 0; i < arraysize(safe_headers); ++i) {
     EXPECT_TRUE(HttpUtil::IsSafeHeader(safe_headers[i])) << safe_headers[i];
-    EXPECT_TRUE(HttpUtil::IsSafeHeader(StringToUpperASCII(std::string(
-        safe_headers[i])))) << safe_headers[i];
+    EXPECT_TRUE(HttpUtil::IsSafeHeader(
+        base::StringToUpperASCII(std::string(safe_headers[i]))))
+        << safe_headers[i];
   }
 }