Giving a couple of HandleRequestCallback functions unique names

The different HandleRequestCallback functions clashed in jumbo
builds so this patch renames them.

Jumbo builds are builds where cc files are merged for dramatically
higher build performance.

Bug: 746953
Change-Id: Ie854181f45d8b7d8684ed1da4c96b8ac1b644646
Reviewed-on: https://chromium-review.googlesource.com/725700Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Bence Béky <bnc@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#510203}

content/browser/accessibility/accessibility_ui.cc

@@ -115,9 +115,10 @@ std::unique_ptr<base::DictionaryValue> BuildTargetDescriptor(
                                accessibility_mode);
 }
 
-bool HandleRequestCallback(BrowserContext* current_context,
-                           const std::string& path,
-                           const WebUIDataSource::GotDataCallback& callback) {
+bool HandleAccessibilityRequestCallback(
+    BrowserContext* current_context,
+    const std::string& path,
+    const WebUIDataSource::GotDataCallback& callback) {
   if (path != kTargetsDataFile)
     return false;
   std::unique_ptr<base::ListValue> rvh_list(new base::ListValue());
@@ -201,7 +202,7 @@ AccessibilityUI::AccessibilityUI(WebUI* web_ui) : WebUIController(web_ui) {
   html_source->AddResourcePath("accessibility.js", IDR_ACCESSIBILITY_JS);
   html_source->SetDefaultResource(IDR_ACCESSIBILITY_HTML);
   html_source->SetRequestFilter(
-      base::Bind(&HandleRequestCallback,
+      base::Bind(&HandleAccessibilityRequestCallback,
                  web_ui->GetWebContents()->GetBrowserContext()));
 
   html_source->UseGzip({kTargetsDataFile});

content/browser/net/network_errors_listing_ui.cc

@@ -57,9 +57,10 @@ std::unique_ptr<base::ListValue> GetNetworkErrorData() {
   return error_list;
 }
 
-bool HandleRequestCallback(BrowserContext* current_context,
-                           const std::string& path,
-                           const WebUIDataSource::GotDataCallback& callback) {
+bool HandleWebUIRequestCallback(
+    BrowserContext* current_context,
+    const std::string& path,
+    const WebUIDataSource::GotDataCallback& callback) {
   if (path != kNetworkErrorDataFile)
     return false;
 
@@ -87,7 +88,7 @@ NetworkErrorsListingUI::NetworkErrorsListingUI(WebUI* web_ui)
                                IDR_NETWORK_ERROR_LISTING_JS);
   html_source->SetDefaultResource(IDR_NETWORK_ERROR_LISTING_HTML);
   html_source->SetRequestFilter(
-      base::Bind(&HandleRequestCallback,
+      base::Bind(&HandleWebUIRequestCallback,
                  web_ui->GetWebContents()->GetBrowserContext()));
 
   BrowserContext* browser_context =