Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/about_flags_unittest.cc

Index: chrome/browser/about_flags_unittest.cc
diff --git a/chrome/browser/about_flags_unittest.cc b/chrome/browser/about_flags_unittest.cc
index 42698ded95748f00a9da0318894e9218cdfaac09..0cb9fa78835f36a552cf7fe0ffe1ed07170e7871 100644
--- a/chrome/browser/about_flags_unittest.cc
+++ b/chrome/browser/about_flags_unittest.cc
@@ -344,7 +344,7 @@ TEST_F(AboutFlagsTest, CheckValues) {
 #if defined(OS_WIN)
   EXPECT_EQ(std::wstring::npos,
             command_line.GetCommandLineString().find(
-                ASCIIToWide(switch1_with_equals)));
+                base::ASCIIToWide(switch1_with_equals)));
 #else
   EXPECT_EQ(std::string::npos,
             command_line.GetCommandLineString().find(switch1_with_equals));
@@ -357,7 +357,7 @@ TEST_F(AboutFlagsTest, CheckValues) {
 #if defined(OS_WIN)
   EXPECT_NE(std::wstring::npos,
             command_line.GetCommandLineString().find(
-                ASCIIToWide(switch2_with_equals)));
+                base::ASCIIToWide(switch2_with_equals)));
 #else
   EXPECT_NE(std::string::npos,
             command_line.GetCommandLineString().find(switch2_with_equals));