[chromium]: Annotate StringImpl::createStatic leak for LeakSanitizer.

Changes to enable annotating known leaks in blink so that leak sanitizer doesn't raise alarm.
Removing addition of StringImpl::createStatic from tools/lsan/suppressions.txt
This patch currently just handles Leak Sanitizer only. The changes for Heap Checker would be done in a follow up patch.

BUG=268258
TEST=Running content_unittests with Leak Sanitizer enabled.
Output of Leak Sanitizer before the fix: http://pastebin.com/niDgRNAQ
Output of Leak Sanitizer after the fix: http://pastebin.com/v6hF43Lj

Review URL: https://chromiumcodereview.appspot.com/23460014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221586 0039d316-1c4b-4281-b951-d872f2087c98

AUTHORS

@@ -213,6 +213,7 @@ Ramkumar Gokarnesan <ramkumar.gokarnesan@gmail.com>
 Ramkumar Ramachandra <artagnon@gmail.com>
 Randy Posynick <randy.posynick@gmail.com>
 Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
+Ravi Phaneendra Kasibhatla <r.kasibhatla@samsung.com>
 Ravi Phaneendra Kasibhatla <ravi.kasibhatla@motorola.com>
 Rene Bolldorf <rb@radix.io>
 Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>

build/common.gypi

@@ -3283,6 +3283,7 @@
                 ],
                 'defines': [
                   'LEAK_SANITIZER',
+                  'WTF_USE_LEAK_SANITIZER=1',
                 ],
               }],
             ],

tools/lsan/suppressions.txt

@@ -4,9 +4,6 @@ leak:base::ToolsSanityTest_MemoryLeak_Test::TestBody
 # False positives in libfontconfig. http://crbug.com/39050
 leak:libfontconfig
 
-# Intentionally leaked "static" strings in Blink. http://crbug.com/268258
-leak:WTF::StringImpl::createStatic
-
 # V8 leak, expect 1024 bytes leaked per process. http://crbug.com/99304
 leak:v8::internal::V8::Initialize