Escaping file names correctly. Also fixed a crush in chromeos debug build while saving a web page.

net/base/escape_unittest.cc

Index: net/base/escape_unittest.cc
diff --git a/net/base/escape_unittest.cc b/net/base/escape_unittest.cc
index 5211fdf4e48712b402e0eb8357c560ec4954f90c..cc5d26de5a44e11fd4a4b19687f53b26270dbab9 100644
--- a/net/base/escape_unittest.cc
+++ b/net/base/escape_unittest.cc
@@ -155,6 +155,19 @@ TEST(EscapeTest, EscapeUrlEncodedData) {
     "%7B%7C%7D~%7F%80%FF");
 }
 
+TEST(EscapeTest, EscapeUrlEncodedDataSpace) {
+  ASSERT_EQ(
+    EscapeUrlEncodedData(
+      "a b"),
+    // Escaped
+    "a+b");
+  ASSERT_EQ(
+    EscapeUrlEncodedData(
+      "a b", false),
+    // Escaped
+    "a%20b");
+}
+
 TEST(EscapeTest, UnescapeURLComponentASCII) {
   const UnescapeURLCaseASCII unescape_cases[] = {
     {"", UnescapeRule::NORMAL, ""},