Use FindIgnoring{ASCIICase,Case} instead of using Find()'s third argument

When this is statically known at compile time, there's no need to do
dynamic dispatch.

Bug: 709815
Change-Id: I8cdd314d306c3b5557951b6bf94911be24c73d7a
Reviewed-on: https://chromium-review.googlesource.com/489642Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#468214}

third_party/WebKit/Source/core/dom/DOMImplementation.cpp

@@ -175,7 +175,7 @@ bool DOMImplementation::IsJSONMIMEType(const String& mime_type) {
   if (mime_type.StartsWith("application/json", kTextCaseASCIIInsensitive))
     return true;
   if (mime_type.StartsWith("application/", kTextCaseASCIIInsensitive)) {
-    size_t subtype = mime_type.Find("+json", 12, kTextCaseASCIIInsensitive);
+    size_t subtype = mime_type.FindIgnoringASCIICase("+json", 12);
     if (subtype != kNotFound) {
       // Just check that a parameter wasn't matched.
       size_t parameter_marker = mime_type.Find(";");

third_party/WebKit/Source/core/html/parser/HTMLParserIdioms.cpp

@@ -358,7 +358,7 @@ String ExtractCharset(const String& value) {
   unsigned length = value.length();
 
   while (pos < length) {
-    pos = value.Find(kCharsetString, pos, kTextCaseASCIIInsensitive);
+    pos = value.FindIgnoringASCIICase(kCharsetString, pos);
     if (pos == kNotFound)
       break;
 

third_party/WebKit/Source/core/html/parser/XSSAuditor.cpp

@@ -907,14 +907,12 @@ String XSSAuditor::CanonicalizedSnippetForJavaScript(
 bool XSSAuditor::IsContainedInRequest(const String& decoded_snippet) {
   if (decoded_snippet.IsEmpty())
     return false;
-  if (decoded_url_.Find(decoded_snippet, 0, kTextCaseUnicodeInsensitive) !=
-      kNotFound)
+  if (decoded_url_.FindIgnoringCase(decoded_snippet, 0) != kNotFound)
     return true;
   if (decoded_http_body_suffix_tree_ &&
       !decoded_http_body_suffix_tree_->MightContain(decoded_snippet))
     return false;
-  return decoded_http_body_.Find(decoded_snippet, 0,
-                                 kTextCaseUnicodeInsensitive) != kNotFound;
+  return decoded_http_body_.FindIgnoringCase(decoded_snippet, 0) != kNotFound;
 }
 
 bool XSSAuditor::IsLikelySafeResource(const String& url) {

third_party/WebKit/Source/core/inspector/InspectorDOMAgent.cpp

@@ -1009,14 +1009,13 @@ Response InspectorDOMAgent::performSearch(
           AttributeCollection attributes = element->Attributes();
           for (auto& attribute : attributes) {
             // Add attribute pair
-            if (attribute.LocalName().Find(whitespace_trimmed_query, 0,
-                                           kTextCaseUnicodeInsensitive) !=
-                kNotFound) {
+            if (attribute.LocalName().FindIgnoringCase(whitespace_trimmed_query,
+                                                       0) != kNotFound) {
               result_collector.insert(node);
               break;
             }
-            size_t found_position = attribute.Value().Find(
-                attribute_query, 0, kTextCaseUnicodeInsensitive);
+            size_t found_position =
+                attribute.Value().FindIgnoringCase(attribute_query, 0);
             if (found_position != kNotFound) {
               if (!exact_attribute_match ||
                   (!found_position &&

third_party/WebKit/Source/platform/network/HTTPParsers.cpp

@@ -305,8 +305,7 @@ bool ParseHTTPRefresh(const String& refresh,
       ++pos;
     SkipWhiteSpace(refresh, pos, matcher);
     unsigned url_start_pos = pos;
-    if (refresh.Find("url", url_start_pos, kTextCaseASCIIInsensitive) ==
-        url_start_pos) {
+    if (refresh.FindIgnoringASCIICase("url", url_start_pos) == url_start_pos) {
       url_start_pos += 3;
       SkipWhiteSpace(refresh, url_start_pos, matcher);
       if (refresh[url_start_pos] == '=') {
@@ -406,7 +405,7 @@ void FindCharsetInMediaType(const String& media_type,
   unsigned length = media_type.length();
 
   while (pos < length) {
-    pos = media_type.Find("charset", pos, kTextCaseASCIIInsensitive);
+    pos = media_type.FindIgnoringASCIICase("charset", pos);
     if (pos == kNotFound || !pos) {
       charset_len = 0;
       return;

third_party/WebKit/Source/platform/network/mime/ContentType.cpp

@@ -41,7 +41,7 @@ String ContentType::Parameter(const String& parameter_name) const {
   size_t semi = stripped_type.find(';');
   if (semi != kNotFound) {
     size_t start =
-        stripped_type.Find(parameter_name, semi + 1, kTextCaseASCIIInsensitive);
+        stripped_type.FindIgnoringASCIICase(parameter_name, semi + 1);
     if (start != kNotFound) {
       start = stripped_type.find('=', start + parameter_name.length());
       if (start != kNotFound) {