Remove some legacy versions of StartsWith and EndsWith.

This just replaces
  true -> base::CompareCase::SENSITIVE
  false -> base::CompareCase::INSENSITIVE_ASCII

I checked the insensitive cases to make sure they're not doing anything suspicious. The old version is a sometimes-correct Unicode comparison so converting to INSENSTITIVE_ASCII isn't a no-op. However, generally the prefix/suffix checking is done against a hardcoded string so there were very few cases to actually look at.

extensions/browser/api/declarative_webrequest/webrequest_condition_attribute.cc has a not-quite search-and-replace change where I changed the type of a class variable.

BUG=506255
TBR=jam

Reland of http://crrev.com/1239493005

Review URL: https://codereview.chromium.org/1233043003

Cr-Commit-Position: refs/heads/master@{#339071}
diff --git a/components/variations/net/variations_http_header_provider.cc b/components/variations/net/variations_http_header_provider.cc
index fd7be82..583d77a 100644
--- a/components/variations/net/variations_http_header_provider.cc
+++ b/components/variations/net/variations_http_header_provider.cc
@@ -280,7 +280,8 @@
   // is very straight forward.
   const std::string host = url.host();
   for (size_t i = 0; i < arraysize(kSuffixesToSetHeadersFor); ++i) {
-    if (base::EndsWith(host, kSuffixesToSetHeadersFor[i], false))
+    if (base::EndsWith(host, kSuffixesToSetHeadersFor[i],
+                       base::CompareCase::INSENSITIVE_ASCII))
       return true;
   }