cc: Unify context losing machinery

cc/prioritized_resource_manager.cc

Index: cc/prioritized_resource_manager.cc
diff --git a/cc/prioritized_resource_manager.cc b/cc/prioritized_resource_manager.cc
index 93de1820b3924c150fe98619bb82c791d7bf26dc..57887f868395d8758444e95822f3028bd34bfbd3 100644
--- a/cc/prioritized_resource_manager.cc
+++ b/cc/prioritized_resource_manager.cc
@@ -312,7 +312,6 @@ void PrioritizedResourceManager::reduceMemory(ResourceProvider* resourceProvider
 void PrioritizedResourceManager::clearAllMemory(ResourceProvider* resourceProvider)
 {
     DCHECK(m_proxy->isImplThread() && m_proxy->isMainThreadBlocked());

[ccameron, 2012/12/18 19:24:01]

Or alternatively, if resourceProvider is NULL, we should assert that there are
no non-evicted backings.

I'd still prefer to just never allow a NULL resourceProvider.

-    DCHECK(resourceProvider);
     evictBackingsToReduceMemory(0,
                                 PriorityCalculator::allowEverythingCutoff(),
                                 EvictAnything,
@@ -404,7 +403,6 @@ PrioritizedResource::Backing* PrioritizedResourceManager::createBacking(gfx::Siz
 void PrioritizedResourceManager::evictFirstBackingResource(ResourceProvider* resourceProvider)
 {
     DCHECK(m_proxy->isImplThread());
-    DCHECK(resourceProvider);
     DCHECK(!m_backings.empty());
     PrioritizedResource::Backing* backing = m_backings.front();